Hello there :)
I tried solving this problem and got the answer "The value is the same as it was two years ago." However, the answer for this problem must be, "It is 99% of what it was 2 yrs ago", according to the book. Can anyone please explain to me how to solve for the correct answer?

The value of your stock portfolio fell 10 % last year, but this year it increased by 10 %. How does the current value of your portfolio compare to what it was two years ago?