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McGraw-Hill Math Grade 7 Answer Key Lesson 15.7 Percent Markups and Markdowns
Exercises
SOLVE
Question 1.
Valerie buys a book that costs $22.00, plus 8.25% sales tax. What does she pay for the book?
Answer:
Cost of the book = $22.00
Sales tax = 8.25%
Calculate the tax:
(8.25/100) x $22.00 = $1.82
Add the tax to the cost of the book.
$22.00 + $1.82 = $23.82
She pay $23.82 for the book.
Question 2.
Chris always tips his barber 30% for a haircut. If the haircut costs $25.00, how much will Chris leave for a trip?
Answer:
The cost of haircut is $25.00.
Chris always tips his barber 30% for a haircut.
(30/100) x $25.00 = $7.50
Chris leaves $7.50 for a tip.
Question 3.
There is a 4% line fee added to cell phone bills in Bellville. If Erlene’s bill before the fee is $56.80, what is her bill total after the fee is added?
Answer:
There is a 4% line fee added to cell phone bills in Bellville.
Erlene’s before the fee is $56.80.
(4/100) x $56.80 = $2.27
The line fee added to cell phone bills in Bellville is $2.27.
Add the line fee to Erlene’s bill before the fee.
$56.80 + $2.27 = $59.07
Erlene’s total bill is $59.07 after the fee is added.
Question 4.
Bob earns a base salary of $500 per week, plus 6% commission on all his sales. If he sold $3,240 this week, what will his salary be for this week?
Answer:
Bob earns a base salary of $500 per week, plus 6% commission on all his sales.
He sold $3,240 this week.
$3,240 x (6/100) = $194.40
Bob commission on all his sales is $194.40.
Add commission with base salary.
$500 + $194.40 = $694.40
Bob salary for this week is $694.40.
Question 5.
Last year, 32,500 people attended the county fair. This year, 45,800 people attended. What is the percent increase in attendance?
Answer:
Last year, 32,500 people attended the county fair.
This year, 45,800 people attended.
Find the difference between the two amounts.
45,800 – 32,500 = 13,300 people
Percentage increase in attendance = (Difference between the amounts)/(original amounts) x 100
= (13,300/32,500) x 100
= 40.92%
= 41%
The percentage increase in attendance is equal to 41%.
Question 6.
Elba missed 7 out of 60 questions on a test. What percent did she get correct?
Answer:
Elba missed 7 out of 60 questions on a test.
Find the difference between the two amounts.
60 – 7 = 53 questions
Percentage = (Difference between the amounts)/(original amounts) x 100
= (53/60) x 100
= 88.33%
= 88%
88% percentage did she get correct.
Question 7.
A store is having a 15% off sale. What is the new price of a table that originally cost $200?
Answer:
A store is having a 15% off sale.
The original cost is $200.
Multiply the percentage off by the price.
$200 x (15/100) = $30
Subtract the sale off price from original price.
$200 – $30 = $170
The new price of a table is $170.
Question 8.
A dress that was originally $89 is marked down to $75. By what percent was the price decreased?
Answer:
A dress that was originally $89 is marked down to $75.
The difference between the two amounts.
$89 – $75 = $14
Percentage = (Difference between the amounts)/(original amounts) x 100
= ($14/$89) x 100
= 15.73%
= 16%
The price was decreased by16% percentage.
Question 9.
Only 12 people can ride a trolley at one time. This is 20% of the people waiting to ride. How many people are waiting to ride?
Answer:
Only 12 people can ride a trolley at one time.
20% of the people waiting to ride.
20% x r = 12
r = 12 x (100/20)
r = 60 people
60 people are waiting to ride a trolley.
Question 10.
Jack received $40 from his aunt for his birthday. He wants to buy a video game for $27.99, a hat for $7.99, and a candy bar for $.50. Sales tax is 8.5%. What would the total be for his purchases? Will he have enough money?
Answer:
First find the total before the tax.
$27.99 + $7.99 + $0.50 = $36.48
Second calculate the tax.
(8.5/100) x $36.48 = $3.1
Third add the tax to the total.
$36.48 + $3.1 = $39.58
The total for Jack purchases is $39.58.
Yes, Jack have enough money.