PR3 Topic Review

An object that weighs 120 pounds on Earth weighs 20 pounds on the moon. How much would an object that weighs 300 pounds on Earth weigh on the moon?

Answer explanation

 120 lb on Earth = 20 lb on Moon
→ Ratio = 20 ÷ 120 = 1/6
→ 300 × 1/6 = 50 lb
Answer: 50 pounds

The weight of an object on Mars varies directly with its weight on Earth. If a 100-pound object weighs 38 pounds on Mars, how much does a 250-pound object weigh on Mars?

Answer explanation

 100 lb on Earth = 38 lb on Mars
→ Ratio = 38 ÷ 100 = 0.38
→ 250 × 0.38 = 95 lb
Answer: 95 pounds

A child who weighs 60 pounds on Earth weighs 10 pounds on the moon. How much would a 150-pound adult weigh on the moon?

Answer explanation

 60 lb on Earth = 10 lb on Moon
→ Ratio = 10 ÷ 60 = 1/6
→ 150 × 1/6 = 25 lb
Answer: 25 pounds

Emily bought 4 books for $7.25 each and paid 7.5% in sales tax. How much did she pay in total?

Answer explanation

 Cost: 4 × $7.25 = $29.00
Tax: $29.00 × 0.075 = $2.18
Total: $29.00 + $2.18 = $31.18
Answer: $31.18

Nathan purchased 2 video games at $44.99 each and paid a 5.5% sales tax. What was the total cost?

Answer explanation

 Cost: 2 × $44.99 = $89.98
Tax: $89.98 × 0.055 = $4.95
Total: $89.98 + $4.95 = $94.93
Answer: $94.93

Lisa bought 5 journals that each cost $3.95. If the sales tax is 6.25%, what is her final cost?

Answer explanation

 Cost: 5 × $3.95 = $19.75
Tax: $19.75 × 0.0625 = $1.23
Total: $19.75 + $1.23 = $20.98
Answer: $20.98

A customer ordered a meal costing $12.40, a drink for $2.50, and dessert for $6.10. He received a 15% discount. What was his total bill after the discount?

Answer explanation

 Total: $12.40 + $2.50 + $6.10 = $21.00
Discount: $21.00 × 0.15 = $3.15
Final: $21.00 - $3.15 = $17.85
Answer: $17.85

A shopping cart includes a $25.99 jacket, $14.75 jeans, and a $9.80 hat. A 10% discount is applied. What is the total after the discount?

Answer explanation

 Total: $25.99 + $14.75 + $9.80 = $50.54
Discount: $50.54 × 0.10 = $5.05
Final: $50.54 - $5.05 = $45.49
Answer: $45.49

Olivia bought a pair of shoes for $49.99 and a handbag for $34.50. She got a 25% discount on the total. What was her total bill after the discount?

Answer explanation

 Total: $49.99 + $34.50 = $84.49
Discount: $84.49 × 0.25 = $21.12
Final: $84.49 - $21.12 = $63.37
Answer: $63.37

A coat originally cost $120. It is now on sale for $96. What is the percent discount?

Answer explanation

 Original: $120
Sale: $96
Discount: $120 - $96 = $24
Percent: (24 ÷ 120) × 100 = 20%
Answer: 20%