A firm offers terms of $\frac{1}{10},$ net $30.$

What effective annual interest rate does the firm earn when a customer does not take the discount? $($Use $365$ days a year. Do not round intermediate calculations. Round the final answer to $2$ decimal places.$)$

Effective annual interest rate $\%$

a$.$ What effective annual interest rate does the firm earn if the terms are changed to $\frac{2}{10},$ net $30,$ and the customer does not take the discount? $($Use $365$ dalys a year. Do not round intermediate calculations. Round the final answer to $2$ decimal places.$)$

Effective annual interest rate $\%$

b$.$ What effective annual interest rate does the firm earn if the terms are changed to $\frac{1}{10},$ net $45,$ and the customer does not take the discount? $($Use $365$ days a year. Do not round intermediate calculations. Round the final answer to $2$ decimal places.$)$

Effective annual interest rate $\%$

c$.$ What effective annual interest rate does the firm earn if the terms are changed to $\frac{1}{15},$ net $30,$ and the customer does not take the discount? $($Use $365$ days a year. Do not round intermediate calculations. Round the final answer to $2$ decimal places.$)$

Effective annual interest rate

$\%$