PLEASE EXPLAIN WITH FORMULAS, TRYING TO LEARN THE CONCEPTS. THANK YOU.

Everywoman, a relatively new magazine that focuses on issues faced by the average American woman, nets $21 per annual subscription, including retention costs. The annual discount rate is 12%, and the CLV of each newly acquired customer has been calculated to be $53. Calculate the annual retention rate, assuming constant renewal. 0.0% Percent (US)