The interest received by investing Rs. 4500 for 2 years at compound interest of 20% p.a., compounded annually, was re-invested for 3 years at simple interest of 21% p.a. Find the simple interest received.
Compound Interest received = 4500 × {1 + (20/100)}2 – 4500 = 4500 × (12/10)2 – 4500 = 6480 – 4500 = Rs. 1980 Simple interest received = 1980 × 3 × 21 ÷ 100 = Rs. 1247.4
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