please solve by financial calulator or formula not excell thank you!

1. Friendly's Quick Loans, Inc., offers you "three for four or I knock on your door." This means you get $3 today and repay $4 when you get your paycheck in one week (or else). What's the effective annual return (EAR) Friendly's earns on this lending business? If you were brave enough to ask, what APR would Friendly's say you were paying