Question

In what time a sum of money will be multiplied 4 times at S.I of 9% per year​

Answer 1

Step-by-step explanation:

Time (N) = ?

Let the sum be Rs 100.

Rate = 9 ℅

4 × 100 = 400 rs = Amount

Amount = principal + interest

400 = 100 + S.I

S.I = 300 Rs

S.I = P × R × N /100

300 = 100 × 9 × N /100

30000/900 = N

N = 33.3

time = 33 years and 3 months.

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Answer 2

Answer:

Let p rs be the sum . let it becomes 4p Rs after

t year

s.i = 4p- p =3p

r = 6%

S.I =ptr/100

3p= pt6/100

3= 6t/100

6t =300

t = 50