Assume that face value = Rs.100
Dividend per share = Rs.7.5 (as it is 7.5% stock)
By investing Rs.1700, earnings = Rs.143
To get an earning of Rs.7.5, investment required = (1700*7.5)/143 = Rs.89.16
market value of Rs. 100 stock = Rs.(89.16- 1/2) = Rs.88.66