Market value of each share of company A = FV + Premium = Rs 2 + Rs 18 = Rs 20
Investment in company A = Number of shares of company A × MV of each share of company A = 200 × 20 = Rs 4,000
Investment in company B = Number of shares of company B × MV of each share of company B = 45 × 500 = Rs 22,500
Investment in company C = Number of shares of company C × MV of each share of company C = 1 × 10540 = Rs 10,540
∴ Total investment = Investment in company A + Investment in company B + Investment in company C
= Rs 4,000 + Rs 22,500 + Rs 10,540
= Rs 37,040
Thus, the toal investment of Joseph is Rs 37,040.