Answer:
B. k = 95
Explanation:
If we write ...
Total Revenue = k × months
then it is convenient to choose values that make it easy to compute ...
(Total Revenue)/months = k = 950/10 = 95
The same value of k will be obtained from any other pair of values in the table, but dividing by 10 is about the easiest.
_____
Further Explanation
y is said to be proportional to x if there is some constant k such that ...
y = k·x
The constant, k, is called the "constant of proportionality."
In this problem, we have to assume that the independent variable (x) is "months" and that total revenue (y) is proportional to months. Then the relevant constant of proportionality can be found as above.