Converting Time Frequencies

A credit card charges an effective rate of interest of $\displaystyle 1.4\%$ per month.
Calculate the annual effective rate of interest.
Give your answer as a percentage to 1 decimal place.

A savings account offers an effective rate of interest of $\displaystyle 5.2\%$ per year.
Calculate the monthly effective rate of interest.
Give your answer as a percentage to 3 decimal places.

An account offers an effective rate of interest of $\displaystyle 2.4\%$ per quarter.
Calculate the annual effective rate of interest.
Give your answer as a percentage to 2 decimal places.

A bond offers an effective rate of interest of $\displaystyle 3.6\%$ per half-year.
Calculate the monthly effective rate of interest.
Give your answer as a percentage to 3 decimal places.