$($Annual percentage yield$)$ Compute the cost of the following trade credit terms using the compounding formula, or effective annual rate. Note: Assume a $30-$day month and $360-$day year.

a$.\frac{2}{15},$ net $60$

b$.\frac{2}{10},$ net $45$

c$.\frac{3}{15},$ net $75$

d$.\frac{2}{10},$ net $60$

a$.$ When payment is made on the net due date, the APR of the credit terms of $\frac{2}{15},$ net $60$ is $\%($Round to two decimal places.$)$