You can put this solution on YOUR website!
Start with the compound interest formula where A is the return, P is the principal (the amount invested), r is the interest rate, n is the compound frequency, and t is the time (in years)
Divide both sides by 200.
Take the 5th root of both sides.
Take the 5th root of 1.75 to get 1.118 (this is approximate)
Subtract 1 from both sides.
Combine like terms.
So the answer is
which is roughly 11.84%
So the interest rate needed is about 11.84%