if $192 increased to $363 in 2 years. what is the interest rate

Answer 1

If it's simple interest, then

192(1+2r) = 363
1+2r = 1.89
2r = .89
r = 44.5%

If it's anually compound interest then

192(1+r)^2 = 363
(1+r)^2 = 1.89
1+r = 1.374
r = 37.4%

Of course, interest compounded quarterly, monthly, daily, or continuously will have successively smaller interest rates.