exam Maths Puzzle Numerical Ability

The price p and the quantity x sold of a certain product obey the demand equation
x = 200 - 10p.
Express the revenue function R as a function of the number of units sold, x.

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exam Other Question
10[8(15-7)-(4.3)] For the following function, C computes the cost in millions of dollars of implementing a city recycling project when x percent of the citizens participate.
C(x) = (1.4x)/(100 - x)