A man borrowed Rs. 40000 at simple interest from the customer. The rate of interest for 1st year is x%, for 2nd year is (x+3)% and for 3rd year is (x+6)%. At end of 3rd year, man pays Rs. 52000. Find value of x.

7% 8% 4% 10%

7%

SI = A-P = 52000 - 40000 = 12000 Total rate for 3 year = \(\frac{12000}{40000}\) × 100 = 30% x + (x+3) + (x+6) = 30% 3x = 21% = x = 7%