You work as a sales clerk at a fashion boutique. The store is having a 20 percent off everything sale. Additionally, your manager wants you to mark down a stack of jeans from the sale price by 20 percent more. The original cost of the jeans is $30.00, and you calculate the final sale price to be $18.00.

Your Calculation:

30.00 * [1 - (0.20 + 0.20) ]

30.00 * 0.60

18.00

Is there a mistake in the calculation? If so, Identify the mistake.

A) yes, added 20% offs

B) yes, a subtraction mistake

C) yes, a multiplication mistake

D) no mistake, the calculation is correct

E) yes, a decimal placement error

Question

Quentin Duffy

Mathematics

31 October, 08:11

You work as a sales clerk at a fashion boutique. The store is having a 20 percent off everything sale. Additionally, your manager wants you to mark down a stack of jeans from the sale price by 20 percent more. The original cost of the jeans is $30.00, and you calculate the final sale price to be $18.00.

Your Calculation:

30.00 * [1 - (0.20 + 0.20) ]

30.00 * 0.60

18.00

Is there a mistake in the calculation? If so, Identify the mistake.

A) yes, added 20% offs

B) yes, a subtraction mistake

C) yes, a multiplication mistake

D) no mistake, the calculation is correct

E) yes, a decimal placement error

+1

Answers (2)

Know the Answer?

Goon · Answer 1

A.) yes, added 20% offs

Leandro · Answer 2

Your answer is D.

The jeans are 40% off (because you add 20% more).

And the original cost of the jeans is $30.

You could have done:

30 · 0.40 = 12 (Find 40% of $30, then subtract 30 by 40% of 30 to get the new sale price]

30 - 12 = 18

1 - 0.40 = 0.60 (You subtract 1 by 0.40 to get 0.60, which is the % of the original price that you have to pay)

30 · 0.60 = 18