Alright. So when Bob put the $20 in, it was the start of month 1. At the start of month 2, it is 20*2, or 40 dollars. At the start of month 3, it is 40*2, or 20*4, which is $80.
With this, you can get is for 5 months by using the formula:
a*n^t
With a being the $20 he put it, the n being the amount of interes (Double), and the t being the time.
20*2^5
20*32
The rest is up to you.

I would be willing to show you how to get more answers if you wish, but I am not giving just answers.

ok, thanks a bunch! i just don't get this part, 20*2^5
20*32
wouldnt it be 40^5?

THE PENGUIN RULES ALL! AHAHAHAHAHAHA! *Cough*
Hello! My name is Steven, and I am a mentor. Yes, that does mean that I help other people. I have helped over 1000 people to date, and have helped some individuals for over 1/2 a year. The miracle of my life occurred 17 years ago. I say miracle only because 1/4 babies survive to be born.
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Alright, before I start getting tendinitis from writing that over and over again, I'll just say what I mean. I mean that if you ask me about something, let's say walking 10 miles a day, and I think it's rediculous, yet you are asking for something to do, I am NOT going to say "10 miles is the type of a thing a anorexia athletica would do. Try 5." I'll give you something to do.
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Ask away!
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