50 is 20% of what number

How do i work this problem out using the equation a=pe^rt

This is so hard and it’s for a test

Afunction, f(x), represents the height of a plant x months after being planted. students measure and record the height on a monthly basis. select the appropriate domain for this situation. a. the set of all positive real numbers b. the set of all integers oc. the set of all positive integers od. the set of all real numbers reset next