Question

martin finds a shirt on sale for 10% off at a department store. the original price was $20 martin must also pay 8.5% sales tax. how much is the shirt before taxes are applied?

Answer 1

Explanation:

normally it is

cost times discount, then the discounted price times sales tax

so since we want before tax is applied, we disregard the 8.5% and find the 10% off

10% off means 90% (100-10=90)

so 90%=90/100=9/10

9/10 of $20

'of' means multiply with fractions

9/10 times 20=180/10=18

The shirt is $18 before tax

Answer 2

normally it is
cost times discount, then the discounted price times sales tax

so since we want before tax is applied, we disregard the 8.5% and find the 10% off

10% off means 90% (100-10=90)

so 90%=90/100=9/10
9/10 of $20
'of' means multiply with fractions
9/10 times 20=180/10=18
the shirt is $18 before tax