FV of each share = Rs 100
MV of each share = Rs 180
Number of shares purchased = 50
Sum invested = Number of shares purchased × MV of each share = 50 × 180 = Rs 9,000
Dividend received on each share = 40% of FV of each share = 40% of Rs 100 = = Rs 40
Total dividend received = Number of shares purchased × Dividend received on each share = 50 × 40 = Rs 2,000
∴ Rate of return on investment = = 22.2%
Thus, the rate of return on investment is 22.2%.