IBPS RRB PO Mains 30 Jan 2021 Paper

Mohan invested a sum of the amount at the rate of 15% SI per annum for two years and received a total amount of Rs.9984. He invested the same amount at the rate x% per annum at CI for two years and he received interest Rs. 6500 more as compared to the Simple Interest, then find the value of x%.(approximately.)