Nominal value(N.V.)=₹ 25Market Value(M.V.)=₹ 36Dividend(D)=12%Annual income=₹720Let number of shares bought be xAnnual income=D×NV×Number of shares⇒720=12100×25× x⇒x=7200025×12=240Hence 240 shares are bought.Also x=Investment(I)M.V.⇒240=I36⇒I=₹ 8640Hence person should invest ₹ 8640.%Rate of Income=(Annual IncomeInvestment×100)%=(7208640×100)%=8.33%Hence %return or %rate of Income is 8.33%.