Sachin invests $\mathit{₹}8500$ in $10\%$, ₹ 100 shares at ₹ 170 . He sells the shares when the price of each share rises by $\mathit{₹}30$. He invests the proceeds in $12\%\mathit{₹}100$ shares at ₹125. Find:
(i) the sale proceeds.
(ii) the number of ₹ 125 shares he buys.
(iii) the change in his annual income.