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What is Per annul means ?

Per annul means For a year.

P = Principle
R = Rate of per annul
T = Number of years

When we Add Simple Interest into Principle. It becomes into Amount.

Formulas Need to Remember
S.I =( P X R X T / 100 )
Here, P = Principle.
R = Rate per annul.
T = Number of years.

Formula:
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:
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 1:

Find the simple interest on Rs 500 for 5 years at 5 per cent ?

Answer :
SI = 500 x 5 x 5 / 100
Simple interest in 5 years is Rs 125.