Question

A certain amount triples in 20 years under simple interest at a r% per annum. If Rs.15,000 is invested at (r + 5)% simple interest per annum, then find the interest earned after 4 years.

A Rs. 9,000
B Rs. 8,400
C Rs. 7,200
D Rs. 6,000
E Rs. 10,200
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