Question

A man invests a sum of ₹3600 at a simple interest rate of r% per annum for x years. His friend invests ₹4000 at the same rate of interest r% per annum for (x + 4) years. The simple interest earned by the first man is 0.45 times the simple interest earned by his friend.

A 2
B 1
C 4
D 8
E None of these
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