FV = Rs 100
MV = Rs 80
Number of shares purchased = 50
Sum invested = Number of shares purchased × MV of each share = 50 × 80 = Rs 4,000
Dividend received on each share = 20% of FV of each share = 20% of Rs 100 = = Rs 20
Total dividend received = Number of shares purchased × Dividend received on each share = 50 × 20 = Rs 1,000
∴ Rate of return on investment = = 25%
Thus, the rate of return on investment is 25%.