exam Maths Puzzle Numerical Ability

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)

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exam Other Question

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. 54-6 divided by 2 +2=? I just want to make sure I understand the answer, you start by dividing, then subtract 54 - the answer by dividing (3) then add the 6 which gives you 57