Question

what is the intrest on Rs 2160 at the rate of 20% for 4 year ? in how many years Rs 1800 earn the same intrest at the rate of 12%​

Answer 1

Step-by-step explanation:

Given:-

Principle = Rs. 2160

Rate of Interest = 20%

Time = 4 years

To find:-

1)what is the intrest on Rs 2160 at the rate of 20% for 4 years

2)In how many years Rs 1800 earn the same intrest at the rate of 12%

Solution :-

Principle = Rs. 2160

Rate of Interest = 20%

Time = 4 years

We know that

Simple Interest = PTR/100

On Substituting these values in the above formula

=> SI = (2160×4×20)/100

=> SI = (2160×80)/100

=> SI =172800/100

=> SI = 1728

Simple Interest is Rs. 1728

Given that

Principle = Rs. 1800

Simple Interest = Rs. 1728

Rate of Interest = 12%

Let the time be T years

We know that

I = PTR /100

=> T = (100 × I) / PR

On Substituting these values in the above formula

=> T = (100×1728)/(1800×12)

=> T = 1728/(18×12)

=> T = 1728/216

=> T = 8 years

Answer:-

1) Interest = Rs. 1728

2) The required time for the get same interest on Rs. 1800 at the rate of 12% is 8 years

Used formulae:-

• I = PTR /100

• T = (100 × I) / PR

• T = Time

• R = Rate of interest

• P = Principle