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I slightly forgot this topic but maybe, this is the answer...
C(x) = 40x
it means that whatever is your input x, it affects the output..
for example, if you buy 3 meals, using the formula, you will know its cost;
C(3) = 40(3)
C(3) = 120
therefore, the cost of three meals is 120.00
hope it helps..:)
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