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Answer:
 B)  12%
Step-by-step explanation:
The total cost of Carl's payment plan is ...
 $125 + 6×72.40 = $560
The percentage change from the original price is ...
 %change = ((new price)/(original price) -1) × 100%
 = ($560/$500 -1) × 100% = (1.12 -1)×100%
 = 12%
The increase from the original cost is 12%.