Ive been stuck on this for a week and i need to turn it in.

task 1: the problem
read the following email:
dear dr. jones,
our pharmaceutical company now received 47 complaints about the new pain reliever nopain, created in your lab. of the 47 complaints, 24 said their headache got worse, 15 said they had severe cramping after taking the medication, and 8 said they had both problems. we have only been distributing this pain reliever for about 30 days and we are very concerned. it has cost our company roughly 1.2 million dollars to create the drug and we have recorded sales of $98,600 in the past month at $10 a bottle, so that is 9,860 bottles. should we be concerned? do you think we should pull the product and conduct more research? we may end up losing money on this if we pursue this course of action. should we keep the product on the shelves and secretly do more research? or should we just do nothing for the time being, wait it out, and see what happens? get back to us as soon as possible with your recommendation.
you,
jane smith
head of customer relations
using your basic mathematical skills, calculate how long it will take the pharmaceutical company to earn back the amount that it had invested, if it continues to sell the product at the current selling rate.