Verified Answer :

\(512\$-400\$=112\$\\\\\frac{112\$}{400\$}\cdot100\%=0,28\cdot100\%=28\%\\\\28:14=2-years\)

\(512-400=112\\\\ \frac{112}{400} \cdot 100\%= \frac{112}{4}\%=28\%\\ \\ 28 \% : 14\%=2\\ \\Ans. \ 2\ years\)