Question

1
79. The simple interest of 4 years of a sum is⅕ of its principal the rate of interest is:
5
(a) 5%
(b) 6%
(c) 8%
(d) 4%​

Answer 1

Answer:

(a) 5%

let principal amount is : x

SI = ( p*r*t)/100

x/5= (x*r*4)/100

x= (x*r*4)/20

20x=x*4*r

r= 5