Mary bought a shirt on sale for $15.00. The sales tax was 10%. If Mary paid with a $20 bill, what was her change? A-$4.90
B-$5.00
C-$3.50
D-$1.50

Her change was: $3.5

Step-by-step explanation:

Mary bought a shirt on sale for $15.00.

As the sales tax was 10%.

i.e. 10/100 × 15 = $1.5

so the sales tax on $15.00 was $1.5.

Hence, the total cost Mary had to pay to buy the shirt was:

$1.5 + $1.5 = $16.5

As Mary paid with a $20 bill, therefore the change can be calculated as

20 - 16.5 = $3.5.

Therefore, her change was: $3.5

a negative exponent is translated as follows:

so, we have

answer: it's a

step-by-step explanation: