Pratap borrowed a sum of money from Arun at simple interest, at the ra

1.	Pratap borrowed a sum of money from Arun at simple interest, at the rate of 12% per annum for the first three years, 16% per annum for the next five years and 20% per annum for a period beyond eight years at the end of 11 years, the total interest is 6080 rupees more than the sum, what was the sum borrowed ?
Answer» ong>ANSWER: $\huge\underline\bold {Answer:}$ Let the initial cost price of the ARTICLE be 100 rupees. Profit = 20% S.P. of the 1ST dealer $= \frac{100 \times 120 }{100} = 120 \: rupees$ Let the second profit % = X. Then, S.P. of the 2nd dealer $= \frac{120 \times (100 + x)}{100}$ Final S.P. of the article after passing through TWO hands at a profit = 38% $= \frac{100 \times (100 + 38}{100} = 138$ Given, $\frac{120 \times (100 + 38)}{100} = 138$ $= > 12000 + 120x = 13800$ $= > 120x = 1800 \\ = > x = 15\%$ So, if the dealer makes a profit of 20%, then the profit per cent made by the second is 15%.