Question

In how much time will ₹25600 amount to ₹35664, when money is worth 37/4 % per annum.

Answer 1

Time will be 2 years

Solution

Principle = Rs25600
Amount = Rs35664
Rate% = 37/4
Interest = Amount-Principle
= Rs(35664-25600)
= Rs 10064
Interest = 25600× n(n+1)/ 2×12×37/100×4

10064= 1184/12× n(n+1)

cross multiple

12768 = 1184n square + 1184n

take 1184 common

therefore

n square + n - 102

n square +(51-2)n - 102

n square + 51n -2n -102

n(n+51) -2(n+51)
(n+51) (n-2)

either

n+51=0 or n-2=0
n=-51 n=2



therefore N = Time = 2 years

Answer 2

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