The answer is D because it shows the proper equations for both the number of people and the cost.
40% of 250 is 250 × 40/100 = 25 × 4 = 10
Total amount = 15 x 7 = 105
105 ÷ 10 - 10.5
The amount paid would then be 105-10.5=94.5
Answer is C
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