Rohan borrowed a certain sum of money at simple interest. Rate of interest was 3% per annum for first 3 years, 4% per annum for next 5 years and 6% per annum for next 7 years. If he paid Rs 2059 as interest, then what is the sum borrowed (in Rs)?
A) 2400 B) 2500 C) 2900 D) 3100
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SI. (1) = X × 3 × 3 / 100
= 9X / 100
SI (2) = X × 4 × 5 / 100
= 20X / 100
SI (3)= X × 6 × 7 / 100
42 X / 100
TOTAL SI = 9X / 100 + 20X / 100 + 42X/100
71X/100
71X / 100 = 2059
71X = 205900
X = 2900 Rs.
Therefore ,
Principal :- 2900 Rs.
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