exam Maths Puzzle Numerical Ability

rewright the equation in function form

5x-2y=20

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exam Other Question

Kevin earned $165 interest for 1 year on an investment of $1500. At same rate, what amount of interst would be earned by investment of $2500? Here is what I came up with. Please help me. Thank you in advance.
$2500 x 12= $300 interest
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)