AMC 8 1995 Problem 14

A team won $40$ of its first $50$ games. How many of the remaining $40$ games must this team win so it will have won exactly $70 \%$ of its games for the season? $\text{(A)}\ 20 \text{(B)}\ 23 \text{(C)}\ 28 \text{(D)}\ 30 \text{(E)}\ 35$