How to...
What tool in DESMOS do you use to solve a problem like this?
15% of $80 is ?
The percent button.
15% of $80 is ?
$12
If you get a 70% on a test and you want to see how many questions you missed would you add or subtract your % of with the total amount of questions?
Subtract
Mrs. Hughes buys math supplies for her class. The supplies cost $87.20 before tax. The sales tax rate is 6.75%. How much sales tax does Mrs. Hughes pay for the office supplies rounded to the nearest cent?
$5.668
$5.67
The markup rate is 14%. To find the mark up as a percent you would add what number to 14%?
HINT: A percent is always out of .
100
(100+14=114)
72 is what percent of 400
Would you use the % of button or new/original to find the percent?
new/original
45% of $454 is ?
$204.30
A trivia game has 20 questions. If Team A gets 80% correct, how many questions did Team B miss?
80% of 20 = 16
20-16 = 4 wrong
A certain airline charges a service fee of 12% for each plane ticket purchased. What is the total price the airline charges for a $640 plane ticket?
12% of $640 = $76.80
$76.80 + 640 = $716.80
The mark up as a percent is 135%. To find the mark up rate as a decimal you take the new/original. What is the answer?
HINT: The original is what a percent is always out of.
135/100 = 1.35
TRUE (T) or FALSE (F)
To find the mark down as a percent you would:
Step 1 - Subtract (Original - Sale = New/Difference)
Step 2 - New/Original
TRUE
72 is what percent of 400
72/400 = 0.18
0.18 x 100 = 18%
A notes check has 10 parts. If you completed 70%, how many parts did you miss?
70% of 10 = 7
10-7 = 3 incomplete
Mary buys sweatshirts in bulk to sell in her store. Her cost for each sweatshirt is $34. She marks up the sweatshirts 35%. How much does Mary charge per sweatshirt?
35% of $34 = $11.90
$11.90 + $34 = $45.90
Your family wants to give the server a 25% gratuity, and the restaurant's sales tax is 5%. By what percent does the cost of the meal increase with tax and gratuity?
25%+5%= 30%
TRUE (T) OR FALSE (F)
To find the cost with tax, mark up, fee or tip added on you would:
Step 1 - Added Cost + Original = Total Cost
Step 2 - % of Original = added cost in $$
FALSE
170 is what percent of 250
170/250 = 0.68
0.68 x 100 = 68%
A pair of pants cost $40 before tax. What is the cost of the shoes after 7% tax is added on?
7% of $40 = $2.80
$40+$2.80 = $42.80
Mr. Smith is buying items on sale for the PBIS Store. The original price for the item is $30.80. The sale price for the skateboard is $23.10.
Step 1: How much did the decrease/change?
Step 2: Find the percent using the new/original.
Step 1: 65.40-45.78 = $17.90
Step 2: 19.63/65.40 = .30
.30 x 100 = 30%
A group of friends' dinner bill before tax is $43. The sales tax rate is 7.5% and they want to leave a 20% tip. What is their total dinner bill, including tax and tip, rounded to the nearest cent?
7.5%+20% = 27.5%
27.5% of $43 = 11.825
11.825 + 43 = 54.825
$53.83
A group of friends' dinner bill before tax is $43.75. The sales tax rate is 7.5% and they want to leave a 20% tip. What is their total dinner bill, including tax and tip, rounded to the nearest cent?
There are two ways to solve this problem. A shortcut could be to add two numbers together first before finding the % of. Which two would you add?
The percents
20% + 7.5%
23% of 765.89 is ? Round to the nearest cent.
23% of 765.89 = 176.1547
176.15
A book bag cost $137 before tax. What is the cost of the shoes after 7% tax is added on?
7% of $137 = 9.59
$137+$9.59 = $146.59
Sam's Sports Store is having a sale on snowboards. The original price for its Slick Snowboard is $65.40. The sale price for the snowboard is $45.78. What is the percent decrease in the price of the snowboard?
65.40-45.78 = $17.90
19.63/65.40 = .30
.30 x 100 = 30%
Tejas sells gaming software for a yearly salary of $45,000 plus a 2.65% commission on his total sales. If Tejas sells $1.5 million of software during one year, what are Tejas's earnings for that year?
HINT: remove the decimal and add 5 zeros to the 1.5 million
2.65% of 1500000 = 39750
39750+1500000 = 1,539,750