One ticket to a show costs \$ 20 at full price. Susan buys 4 tickets using a coupon that gives her a 25 \% discount. Pam buys 5 tickets using a coupon that gives her a 30 \% discount. How many more dollars does Pam pay than Susan?

**Answer Choices**

A. 2

B. 5

C. 10

D. 15

E. 20