Question

13. A man deposited 9000 in a bank at 6% per
annum for 4 yr. For how many years, must
another man deposit an amount of 5400 at
5% per annum in another bank so that both of
them get the same interest?
(a) 6
(b) 4
(c) 3
(d) None of these​

Answer 1

Answer:

for 8 yrs must another man deposit an amount 5400 at 5% per annum to get the same interest.

case 1 : amount deposited by man, P = 9000

rate of interest , r = 6% per annum

time , t = 4 yrs

interest = P × r × t/100 = 9000 × 6 × 4/100

= 90 × 24 = 2160

case 2 : amount deposited by man , P = 5400

rate of interest , r = 5% per annum

time = t

so, interest = P × r × t/100

= 5400 × 5 × t/100

= 270t

a/c to question,

interests getting by man are same.

so, 2160 = 270t

⇒t = 2160/270 = 216/27 = 8 yrs

Step-by-step explanation:

Answer 2

Step-by-step explanation:

✳Answer✳

✳(d) None of these✳