Christy rented a car. She has to pay $\$ x$ for the first 10 miles and thereafter $\$2.50$ for every mile. If she had travelled $y$ miles. What would be the total cost she has to pay ?

Question

$\begin{array}{1 1} (a)\; c=x+(2.50)y+25 \\ (b)\; c=x+(2.50)y-25 \\ (c)\;c= x-(2.50)y+25 \\ (d)\;c= x-(2.50)y+25 \end{array}$