Erica bought a new rug that cost r dollars. She used a coupon that applied a 20% discount, with a 10% sales tax. If there is a shipping and handling fee of $50
applied after the discount and sales tax, which of the following expressions
show the total amount of money that Erica paid for the rug?
A. 0.8r+ 50
B. 0.88r+ 50
C. 0.9r+ 50
D. 1.09r+ 50