Answer:
Mohan kept investing his money for 1 month and 28 days.
Explanation:
Since Buddha and Mohan started business with capitals of Rs. 2400 and Rs. 3000 respectively, and of a total gain of Rs. 800, Mohan who had contributed his capital for 4 months received Rs. 500, to find how long Buddha has contributed his capital, the following calculation must be performed:
Buddha = 2,400
500/4 = 125
2400 = 100
125 = X
125 x 100/2400 = X
5.2 = X
Thus, the investment has an interest rate of 5.2% per month.
Mohan = 3,000
3000 = 100
300 = 10
10 / 5.2 = 1.92
0.92 x 30 = 27.6
Thus, Mohan kept investing his money for 1 month and 28 days.