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Kruti took a loan at simple interest rate of 6 p.c.p.a. in the first year and it increased by 1.5 p.c.p.a. every year. If she pays Rs. 8190 as interest at the end of 3 years, what was her loan amount ?

a) Rs. 35400
b) Rs. 36000
c) Rs. 36800
d) Rs. 36400

Answer: d
Explanation: Let the loan amount be Rs. x
$$\eqalign{ & \frac{{6x}}{{100}} + \frac{{7.5x}}{{100}} + \frac{{9x}}{{100}} = 8190 \cr & 22.5x = 819000 \cr & x = 36400 \cr} $$

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