Hollis Clinics visit charge is $$20$ each. Each visit costs $$13$ of variable costs. During April,

they did $1,000$ visits. Fixed costs totaled $$1,000$ for the month. What is the contribution

margin ratio?

a$.25\%$

b$.35\%$

$\frac{20}{13}=7$

c$.65\%$

d$.75\%$