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The present worth of a bill due 7 months hence is ₹1200. If the bill were due at the end of 2 $$\frac{1}{2}$$yr, Its present worth would be Z ₹1016. What is the rate per cent of the bill?
Since,
S.I. = Principal∗Rate∗Time/100
Therefore, 1200 + 1200∗7∗r/12∗100 = Amount (A)
1200 + 7r = A .........(i)
and 1016 + 1016∗5∗r/2∗100 = A
Therefore, 1016 + 25.4r = A ...(ii)
1016 + 25.4r = 1200 + 7r
So,
25.4r - 7r = 1200 - 1016
18.4r = 184
r = 184/18.4
= 10% per annum
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