Which of the purchases would be the least expensive? Purchase Amount of sale Sales tax rate A 150 dollars 5 percent B 145 dollars 7 percent C 140 dollars 8 percent D 135 dollars 9 percent

Add sales tax to each purchase amount by multiplying by 1 plus the tax rate. Purchase A costs $150 × 1.05 = $157.50; B costs $145 × 1.07 = $155.15; C costs $140 × 1.08 = $151.20; and D costs $135 × 1.09 = $147.15. Purchase D has the lowest total cost, so the correct choice is “purchase D.”

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