Question

A sum of ₹4,000 is invested at r% p.a. simple interest for 3 years, and another sum of ₹6,000 is invested at (r + 2)% p.a. simple interest for 2 years. The total interest received from both investments is ₹3,120. What is the value of r?

A 12%
B 18%
C 20%
D 24%
E None of these
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