Question

only moderator can solve this in copy

Answer 1

Let's take x as Principle

Rate of interest is 10%

Amount will be 1.5*Principle that is 1.5x

Time will be t

Formula to be used: A = P ( 1 + Rt /100 )

1.5x = x(1 + 10t/100)

15x /10 = x ( 1 + t /10 )

15x /10 = x/10 × ( 10 +t )  

(15x / 10 ) × ( 10 / x ) = 10 + t

15 = 10 + t

15 - 10 = t

Therefore t = 5

The answer is 5 years.

Hope it helps :)

Answer 2

Ok,, I Am Not A Modaretor..

_Let's Try To Solve It_

Let's The Sum = p

and

The Time = t

so,

As We Know,

compound interest = p(1+r/100)^t

here, A=1.5

so,

15x/10 = x/10 (10+t)

=>15x/10 × x/10 = 10+t

=>15 = 10+t

=> t = 15 - 10

=> t = 5

So, 5 years needed for becoming 1.5 times of principle.

hope helped