Question

A man invested Rs. 16,000 at simple interest of 'x%' p.a. and received Rs. 32,000 after 2 years. If he had invested Rs. 21,000 at simple interest of 'x%' p.a. for 3 years, then find the interest earned by him from this investment

A Rs. 31200
B Rs. 31300
C Rs. 31700
D Rs. 31500
E None of these
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