Will someone please help me remember how to solve this problem. We went over it in class but I can't make sense of it now. The question comes from Quiz 1, Plugging Numbers & Plugging Answers.

9. Each cartoonist for the local newspaper is paid as follows: c dollars

for each of the first n cartoons each month, and c + d for each

cartoon thereafter, where c > d. How many more dollars will a

cartoonist who submits n + c cartoons in a month earn than a

cartoonist who submits n + d cartoons?

a) (c - d)(c + d + n)

b) c – d

c) c2 - d2

d) n(c – d)

e) cn + dn – cn

Thank you!