Finding a percentage of a total amount without a calculator: Sales tax, commission, discount Online Quiz

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Q 1 - If the sales tax rate is 7.5%, then how much sales tax would you pay for a $40 shirt?

Answer : B

Explanation

Step 1:

Rate of sales tax = 7.5%

Cost of shirt = $40

Step 2:

Sales tax = 7.5% of $40 = 0.075 × 40 = $3

Q 2 - At an electronics store, a 42-inch TV sells for $1400 at a 12% discount and sales tax is 6.5%. What is the final cost?

Answer : A

Explanation

Step 1:

Marked price of TV = $1400

Discount = 12% of $1400 = 0.12 × 1400 = $168

Price after discount = $ 1400 − $168 = $1232

Step 2:

Sales tax = 6.5% of $1232 = $80.08

Final cost = $1232 + $80.08 = $1312.08

Q 3 - If your meal costs $81, and sales tax is 6.5% and if you tip the waiter 15%, how much would you pay?

Answer : D

Explanation

Step 1:

Bill amount = $81

Sales tax = 6.5% of $81 = 0.065× 81 = $5.27

Tip = 15% of $81 = 0.15 × 81 = $12.15

Step 2:

Final amount paid = Bill amount + sales tax + tip

= $81 + $5.27 + $12.15

= $98.42

Q 4 - If your phone bill was $75.80 and if there is a 2.5% discount on prompt payment, how much will you pay if you paid in time?

Answer : C

Explanation

Step 1:

Bill amount = $75.80

Discount = 2.5% of $75.80 = $1.90

Step 2:

Amount paid after discount = $75.80 − $1.90

= $73.90

Q 5 - At a store, a $59 dress is marked down 20%. What is the discount? What is the sale price of the dress?

Answer : C

Explanation

Step 1:

Marked price of dress = $59

Discount = 20% of $59 = 0.20 × $59 = $11.80

Step 2:

Sales price of the dress = $59 − $11.80

= $47.20

Q 6 - The sales tax on a $1350 computer is $94.50. What is the rate of sales tax?

Answer : A

Explanation

Step 1:

Sale price of computer = $1350

Sales Tax = $94.50

Step 2:

Rate of sales tax = 94.50/1350 × 100

= 7%

Q 7 - The price of a car is $28,990. If the sales tax rate is 6%, then how much sales tax is being charged?

Answer : D

Explanation

Step 1:

Price of car = $28,990

Rate of sales tax = 6%

Step 2:

Sales tax being charged = 6% of $28,990

= 0.06 × 28,990 = $1739.40

Q 8 - In a store, a $8 bag of candy marked down 40%. What is the discount? What is the sale price of the bag of candy?

Answer : B

Explanation

Step 1:

Price of candy = $8

Mark down on candy = 40% of $8 = 0.4 × 8

= $3.20

Step 2:

Sale price of bag of candy = $8 − $3.20

= $4.80

Q 9 - In a store, a shirt that sells for $24 is marked “15% off.” What is the discount? What is the sale price of the shirt?

Answer : A

Explanation

Step 1:

Marked price of shirt = $24

Discount on the shirt = 15% of $24 = 0.15 × 2

= $3.60

Step 2:

Sale price of shirt = $24.00 − $3.60

= $20.40

Q 10 - Mike is a salesman who earns a base salary of $360 per week plus 9% commission on sales. What was Mike’s weekly salary if his total sales for the week were $6300?