The original price of a shirt is reduced by 50 \% to obtain a second price. The store advertises an additional sale, and so this second price is reduced by 40 \% to obtain a third price. What is the discount of the third price off the original price?
Answer Choices
A. 80 \%
B. 10 \%
C. 70 \%
D. 65 \%
E. 45 \%