Question

A principal the doubles itself in X years at simple interest at 20% per annum. what is X?​

Answer 1

Answer:

5 years

Step-by-step explanation:

we know that,

SI = PTR/100,

and amount = P + SI

given,

rate of interest = 20% per annum,

given ,P2 = 2P1,

therefore,

P2 = P1 + (P1*T*20)/100,

=> 2P1 = P1(1 + 20T/100),

=> 2 = 1 + T/5,

=> T/5 = 1,

=> T = 5 .

Hope it helps u...