Question

HEYA!!
#BTSARMY
Kavita has a cumulative time deposit account in a bank. She deposits 1800 per month and
gets +16700 as maturity value. If the rate of interest be 5% per annum, find the total time
for which the account was held.
[Hint: x2 + 481x - 10020 = 0 = x2 + 501x – 20x - 10020 = 0.]
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Answer 1

Answer:

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Step-by-step explanation:

P = 1800

MV = 16700

r = 5%

Mv = p×n + (p×n×(n+1)×r)/100×12×2

16700 = 1800n + (1800×(n^2 + n) ×5)/100×12×2

16700 = 1800n + (15n^2 + 15n) /4

16700×4 = 7200n + 15n^2 + 15n

n2 + 481n - 10020 = 0

n2 + 501n - 20n - 10020 =0

(n+501)(n-20)

n-20=0

n=20 months

Answer 2

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