C) $20
40 divided by 30 is 1.3
1.3 times 15 is 30
$200 divided by 100 customers = 2$.
So, if he wants to make a profit of $200, he would have to make each customer pay $2. :)
The function f(x) represents the number of toys sold per month, where "x" represents the number of months since June

This function was transformed resulting in the function:

When you add a constant to a function, the resulting transformation is a vertical translation up. In this case, the function f(x) was translated 7 units up.
In terms of the variables, this translation in
15 is your percentage to the answer