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Question

The bankers discount on a sum of money for 1 \(\frac{1}{2}\) years is Rs. 558 and the true discount on the same sum for 2 years is Rs. 600. The rate percent is:

Options:
A .  10%
B .  13%
C .  12%
D .  15%
Answer: Option C

B.D. for  \(\frac{3}{2}\)years = Rs. 558


B.D. for 2 years = Rs. \(\left(558\times\frac{2}{3}\times2\right)\)


= Rs.744


T.D. for 2 years = Rs. 600.


So, Sum = \(\frac{B.D.\times T.D.}{B.D.- T.D.} = Rs.\left(\frac{744\times600}{144}\right) = Rs. 3100\)


Thus, Rs. 744 is S.I. on Rs. 3100 for 2 years.


Therefore Rate =   \( \left(\frac{100\times744}{3100\times2}\right)\) % = 12 %


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