Find a Percent
Percent Change
Tax, Tip, and Mark up
Discount
Interest
Extension Problems
100
solve using a percent proportion
What is 40% of 30?
12 is 40% of 30
"P"/30=("40%")/100
100
Find the percent increase or decrease using a percent proportion. Round to the nearest whole percent.
47 to 58
19% increase
11/47=x/100
100
Find the total cost to the nearest cent. Use a percent proportion or percent equation to find the solution.
$37 steak dinner, 20% tip
Total Cost would be $44.40
100
Find the Sale Price to the nearest cent. Use a percent proportion of percent equation.
Gel Pens, $45, 20% discount
The sales price would be $36
100
Find the simple interest earned to the nearest cent for each principal, interest rate, and time.
$500, 4%, 2 years
The simple interest would be $40
100
INVESTMENTS Terry invested $2,200 in the stock market for 2 years. If the investment earned 12%, how much money did Terry earn in 2 years?
Terry earned $528 in 2 years
200
Use the percent equation to calculate
What is 130% of 40?
52 is 130% of 40?
P = 1.3(40)
200
Find the percent increase or decrease using a percent proportion.Round to the nearest whole percent.
35 to 20
43% decrease
200
Find the total cost to the nearest cent.
Use a percent proportion or percent equation to find the solution.
$139.99 ultra light mummy sleeping bag; 6.25% tax.
Total Cost would be $148.74
200
Find the Sale Price to the nearest cent. Use a percent proportion of percent equation.
$25.95 Futbol; 15% discount
Sales price would be $22.06
200
Find the simple interest earned to the nearest cent for each principal, interest rate, and time.
$955, 6.75%, 3.25 years
The simple interest would be $209.50
200
Andrea ordered a computer on the Internet. The computer cost $1,399 plus 6 % sales tax. What was the total amount Andrea paid for her computer?
The total amount for the computer was $1,482.94
300
Use a Percent Proportion to find answer.
80 percent of what number is 32?
80 percent of 40 is 32.
32/W =80/100
300
Find the percent increase or decrease using a percent proportion or percent equation. Round to the nearest whole percent.
$75 to $45
40% decrease
300
Find the total cost to the nearest cent.
Use a percent proportion or percent equation to find the solution.
$8.50 shorts; 65% markup
Cost will be $14.03
300
Find the Sale Price to the nearest cent. Use a percent proportion of percent equation to solve.
$213 ski jacket; 30% discount
$149.10 is the sales price.
P=0.7(213)
300
Find the simple interest earned to the nearest cent for each principal, interest rate, and time.
$568, 16%, 8 months
The interest would be $60.59
300
The Striton family had a meal catered for a wedding rehearsal dinner. The cost of the dinner was $476. There was a 5% sales tax and they left a 15% tip. What was the total cost including the sales tax and the tip?
The total cost was $570
400
Write a proportion for each problem. Then solve. Round to the nearest tenth if necessary.
25 is what percent of 20?
25 is 125% of 20
25/20 =x/100
400
Eva estimates that 475 songs will fit on her MP3 player. The actual amount of songs that fit is 380. Find the percent error.
It is a 25% error
("Amount of Error")/("Actual")=("%error")/100
400
Find the total cost to the nearest cent.
Use a percent proportion or percent equation to find the solution.
What is the sales tax on a $17,500 truck if the tax rate is 6%?
Sales tax will be $1,050.00
400
Find the Sale Price to the nearest cent. Use a percent proportion of percent equation to solve.
$210.99 CD; 25% discount
Sales price is $158.24
400
Find the simple interest earned to the nearest cent for each principal, interest rate, and time.
$2,650, 3.65%, 2.5 years
The simple interest would be $241.81
400
COSMETICS Jaylynn was buying new mascara. She bought it on sale for $5.56. If the price represents a 20% discount from the original price, what is the original price to the nearest cent?
The original Price was $6.95
("Sales Price")/("Original Price")=80/100
500
Marcos has $81 left to spend.
500
A family pays $35 each month for Internet access. Next month, the cost will increase 25% because of an equipment fee. After this increase, what will be the cost for Internet access?
The monthly cost will be $43.75
500
Find the total cost to the nearest cent.
Use a percent proportion or percent equation to find the solution.
$125 dinner; 20% tip, 7% tax
Total Cost would be $158.75
500
Use a percent proportion of percent equation to solve
A box of laundry detergent is on sale for $6.50. If this price represents a 40% discount from the original price, what is the original price to the nearest cent?
The original price is $10.83
6.50/("original price")="60%"/100
500
When Melissa was born, her parents put $8,000 into a college fund account that earned 9% simple interest. Find the total amount, to the nearest cent in the account after 18 years.
after 18 years, the total amount will be $20,960.
500
Kelli Rae's inheritance from her great–grandmother was $220,000 after taxes. If Kelli Rae invests this money in a savings account that earns $18,260 in simple interest every year, what is the interest rate on her account?
The interest rate would be 8.3%.