The function for the cost of materials to make a biscuit is f (x) = four-fifths x + 4, where x is the number of biscuits. The function for the selling price of those biscuits is g (f (x)), where g (x) = 4x + 5. Find the selling price of 15 biscuits.
The answers are-
A.) 16
B.) 56
C.) 65
D.) 69
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