Question 1164044
The compound interest formula is: P(t) + P0(1 + r/n)^nt, where 
P0 = initial principal, r = the interest rate, n = number of times interest
compounded per year, t = the number of years
We need to solve for the initial principal, P0, given r = 0.18, n = 12, t = 6, P = 50000
P0 = 50000/(1 + 0.18/12)^(6*12) -> P0 = $17116.50