Answer:
Purchase D would be the least expensive.
Explanation:
To find which of the purchase would be the least expensive, we have to add all the purchase amount to the sale tax.
Purchase A. Amount of sale = 150
Sales tax rate = 5%
Total = 150 + (5% of 150)
= 150 + (0.05 × 150)
= 150 + 7.5 = $157.50
Purchase B. Amount of sale = $145.00
Sales tax rate = 7%
Total = 145 + (7% of 145)
145 + (0.07 × 145)
145 + 10.15 = $155.15
Purchase C. Amount of sale = $140.00
Sales tax rate = 8%
Total = 140 + (8% of 140)
= 140 (0.08 × 140)
= 140 + 11.20 = $151.20
Purchase D. Amount of sale = $135.00
Sales tax rate = 9%
Total = 135 + (9% of 135)
135 + (0.09 × 135)
135 + 12.15 = $147.15
Purchase D would be the least expensive.