Question

A sum of money becomes 4 times after a time period at the rate of 4%p.a.,calculate
time period.

Answer 1

Answer:

Let principle, p = 100

4 times of p = 400

A=400

SI = A-P

SI = 300

Total SI deviding by rate of interest will get time, and total SI deviding by time will get rate of interest

T = SI/R

T= 300/5 ie : 60 year

T = 60 year

When p become 7 time = A = 700 , R = ?

SI = A-p

SI =700–100= 600

R =SI/T

R= 600/60

R= 10%

Answer 2

Answer:

75

Step-by-step explanation:

Let principal (P) = x

Therefore, amount (A) = 4x

SI = A - P

= 4x - x

= 3x

Rate (R) = 4% p.a.

Time (T) = 100 × SI ÷ P × R

= 100 × 3x ÷ x × 4

= 75 years