13.1 and 13.2
Write this ratio as a percent:
160:400
40%
what is 25% of 48
12
Peggy earned $20 for each lawn she mowed last summer. This summer, she raised her price to $23 per lawn. What was the percent increase of Peggy's charges?
15% increase
23-20= 3
3/20= 0.15
0.15x100= 15% increase
Ella buys a computer for $785. Her local tax rate is 7%. How much does she pay total for her computer, including the tax?
$839.95
A savings account pays an annual simple interest rate 1.5%
How much interest would you earn in 1 year on $2,000?
$30
The ratio of seventh graders to sixth graders on a chess team is 5 to 3.
What is the ratio of seventh graders to total chess players?
5:8 or 5/8
A zoo has 1 Giraffe for every 4 Zebras. What percent of this grouping is Giraffes and what percent are Zebras?
20% Giraffes and 80% Zebras
A shipment of 22in pipes contains a pipe that is exactly 21.78 inches. What is the percent error, rounded to the nearest percent?
Hint: Percent error is always positive
|Approximate value - Exact value|/|Exact Value|
21.78-22= -0.22
-0.22/22= -0.01
-0.01x100 = |-1| = 1%
The school secretary orders a new printer and pays $310.30 after tax. The tax rate is 7%. What is the ORIGINAL price of the printer?
$290
It costs $36,736 to repay a loan of $20,500 at 6.6% annual simple interest.
How much interest would you pay each year?
Cassie is painting a rectangular wall in her room. The wall is 12 feet by 15 feet. She plans on painting the top 20% of the wall green and the rest of the wall tan. What is the area of the part of the wall she plans to paint green?
36 Square feet
Step 1: find area length x width
12x15= 180 sq feet
Step 2: find 20% of 180
180 x 0.20 = 36 sq feet
120% of _____ = 18
18/1.2= 15
Find the percent change and whether it is an increase or a decrease.
From 60 to 36
40% decrease
Find the original price given the total and the tip:
$51.84, 20%
$43.20
Delilah deposits $8,255 in an account that pays 4.2% simple interest. How much money will be in the account after 8 years?
$11,028.68
what is 75% of 8
6
Rewrite the fraction 3/5 as a percent and a decimal.
60% and 0.6
A store marks up remote-controlled cars 20%. The original cost was $35. What is the retail price to purchase a remote-controlled car at the store?
$42
The commission is 3.5% of the total sales of $55,000. Find the commission in dollars.
$1,925
Ms. Anderson buys a new car for $24,000 and finances it with a 5-year simple interest loan at an annual rate of 3.75%. What are Ms. Anderson's monthly payments?
I=Prt
P= 24,000 r= 0.0375 t= 5
Interest = $4,500
$4,500 + $24,000= $28,500
5 years x 12 months = 60 months
$28,000/60= $475
The regular price for swimming lessons for an hour is $20 per hour. The sale price for new students is 75% of the regular price. What is the sale price?
$15
Rewrite 30% as a decimal and a fraction in its simplest form.
0.3 and 3/10
A store sells prepaid phones. It purchases the phones and then adds a markup rate of 250%.
Write an equation that can be used to find the amount of markup (y) if the phone store purchases a phone for (x) dollars.
y= 2.5x
y= kx
The base salary is $54,300. The commission is 2.75% of the total sales of $950,000. Find the total earnings.
$80,425
Marisol deposits $5,000 in a savings account earning 5.75% simple interest per year.
How much will Marisol earn after 5 years?
$1,437.50