Correct Answer - Option 2 : 42000
Given:
A started a business by investing Rs. 36000. After 4 months B joined him with some investment. At the end of the year, the total profit was divided between them in the ratio of 9 : 7
Concept used:
Profit = Investment × time period
Calculation:
Investment of A in one year = 36000 × 12
⇒ 432000
Let B invest Rs. x after 4 months
Investment of B after one year = 8x
According to the question,
432000/8x = 9/7
⇒ x = 42000
∴ The capital invested by B is Rs. 42000.