10% is the interest rate.R=5% and n=3, as it is compounded every six months. Let the sum be \(P\).
Given, \(P×\bigg(1+\frac{10}{200}\bigg)^3 = 18522\)
\(⇒ P = 18522×\bigg(\frac{20}{21}\bigg)^3 = 16000\)