Question
A sum of Rs. 1,000 is borrowed at a
certain rate of interest. After 4 months, Rs 500 is again borrowed, but this time at a rate of interest that is thrice the original rate. At the end of the year, the total interest on both the amounts is Rs. 100. What is the original rate per annum?Solution
If x be the original rate `(1000xx1xx x)/100 + (500xx2/3xx3x)/100 = 100` 20x = 100 x = 5%
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