Question

shirts are 30% off. The original price of one shirt is$20. What is the total cost,in dollars, of three shirts, at the sale price, including a 15% sales tax​

Answer 1

$48.30

Explanation:

the other answer's start is correct.

30% discount of $20 is 30/100*20 = $6

so, a shirt costs now only $14.

but sales tax is always calculated from the actual sales price. not from the original list price.

so, we need to calculate 15% of $14 (and not $20) as sales tax.

=> 15/100*14 = $2.10

a shirt now costs incl. sales tax $14 + $2.10 = $16.10

three shirts cost 3 * $16.10 = $48.30

Answer 2

Discount amount= 30/100 X20
=6$
Sales tax amount =15/100X20
=3$
So total price of a shirt with discount and
Sales tax= 20$+3$_6$
=17$
So price of three shirts= 3X17
=51$