For the effective rate to be $7\%,$ what must be the corresponding nominal interest rate with: $($Do not round the intermediate calculations. Round your percentage answers to $2$ decimal places.$)$

a$.$ Annual compounding?

The corresponding nominal interest rate

$\%$

b$.$ Semiannual compounding?

The corresponding nominal interest rate

$\%$

c$.$ Quarterly compounding?

The corresponding nominal interest rate

$\%$

d$.$ Monthly compounding?

The corresponding nominal interest rate

$\%$