SOLUTION: Ms. Price has received a 10% raise in salary in each of the last 2 years. If her annual salary this year is $100,000 What was her salry 2 years ago, rounded to the nearest penny?

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Question 300731: Ms. Price has received a 10% raise in salary in each of the last 2 years. If her annual salary this year is $100,000
What was her salry 2 years ago, rounded to the nearest penny?
I have the answer from the book I bough, but I need to know how to follow step by step. I try and can only get exact amounts by doing it forward. I need to know, how to do it backwards.
This is what I did: 82,644.63 x .1 = 8264.463
+ 8264.463

2ns year: 90900.9093 x .1 = 9090.9093
+ 9090.9093

100,000
Elizabeth R.
Answer by richwmiller(17219) About Me  (Show Source):
You can put this solution on YOUR website!
So what is the book answer?
1.10*(1.10*x)=100000