Anil invested Rs. x in a simple interest scheme at the rate of R% per annum for 4 years and after 4 years, the interest received is 32% of the sum invested. His sister invested Rs. (x + 7500) in a compound interest scheme at the rate of (R + 2)% per annum for 2 years and she received a total amount of Rs. 54450, then find the value of x.