Question 365996
if his average calls per month is x, then through the course of the year, he will make 12*x calls.


if in the month of march, he makes 5 fewer calls, then he completes x-5 calls in march.


if in the month of april, he makes 5 more calls, then he completes x+5 calls in april.


if you add march and april together you get (x-5) + (x+5) calls made.


combine like terms and you get 2*x calls in 2 months.


his monthly average is still x.


it will have no impact on yearly percentage.


10*x + (x-5) + (x+5) = 12*x.


divide that by 12 and you still get x.