Question

Proof P*R*T/100=S.I. and write definition that how you proof?

Answer 1

QUESTION...

• Proof P*R*T/100=S.I. and write definition that how you proof?

ANSWER...

• You have for simple interest at a fixed interest rate per time period R:

I=∑i=1TPR=PRT

• Where I is the total interest after T time periods. Therefore your other formula should read:

P(T)=P(0)(1+RT)

• Where P(T) is the principle after T time periods.

Answer 2

Answer:

S.I =( P X R X T / 100 ).

Here, P = Principle.

R = Rate per annul.

T = Number of years.

Formula 1:

In case S.I ( Simple Interest ), T ( Number of years ) and R (Rate per annul ) are given in Question then we can easily find the Principle or Sum.

P = ( S.I X 100 / R X T ).

Formula 2:

In case S.I ( Simple Interest ), T ( Number of years ) and P ( Principle ) are given in question then we can easily find the R (Rate per annul ).

R = ( S.I X 100 / P X T ).

Example :

Find the simple interest on ₹ 800 for 8 years at the rate of 8 per cent ?

Answer :

SI = 800x 8 x 8 / 100

Simple interest in 8 years is ₹ 512.