Practice the problems of Math in Focus Grade 5 Workbook Answer Key Chapter 10 Percent to score better marks in the exam.

Math Journal

Arnold had dinner at a restaurant with his family. The dinner cost $72. In addition, he paid 7% meals tax on the dinner. How much did Arnold pay for the dinner? Tyrone worked out the answer using his calculator like this: 93% ×$72 = $66.96 Brandon worked out the answer using his calculator like this: 107% ×$72 = $77.04 Whose answer is correct? Explain why his answer is correct. Answer: Brandon answer is correct Explanation: Arnold paid 7% of tax and 100% of his bill 107% ×$72 = $77.04 or Arnold paid$72 + $7% =$72 + $5.04 =$77.04

Challenging Practice

Question 1.
Mr. Stanton bought a cell phone at 80% of the regular price. The regular price of the phone was $450. Mr. Wilson bought the same cell phone but paid$500 for it. How much more did Mr. Wilson pay than Mr. Stanton?
140 more did Mr. Wilson pay than Mr. Stanton
Explanation:
Cell phone regular price is $450 Mr. Stanton paid 80% of 450 =$360
80% x $450=$360
Mr. Wilson paid \$500
500 – 360 = 140
Mr. Wilson pay 140 more than Mr. Stanton.

Question 2.
Helen has 30 tickets. Gina has 20 more tickets than Helen. What percent of her tickets must Gina give Helen so that both of them have the same number of tickets?
Explanation:
Helen has 30 tickets.
Gina has 20 more tickets than Helen = 30 + 20 = 50 tickets
20 percent of her tickets must Gina give Helen so that both of them have the same number of tickets
such that both can have 40 tickets
Gina has 50 tickets
if she give 10 tickets to Helen ,now both are 40 tickets
20% of 50 is 10

Problem Solving

Michelle collects U.S., Canadian, and Mexican stamps. In her collection, 80% of the stamps are U.S. and Mexican stamps. There are 3 times as many U.S. stamps as Mexican stamps. What percent of Michelle’s collection is made up of U.S. stamps?