Find The rate % based question

Shortcut tricks on rate % based are one of the most important topics in exams. Competitive exams are all about time. If you manage your time then you can do well in those exams. Most of us skip that part. Few examples on rate % based shortcuts is given in this page below. All tricks on rate % based are provided here. We request all visitors to read all examples carefully. These examples will help you to understand shortcut tricks on rate % based.

Example 1:
At what rate percent annul will a sum of money double in a 4 years.
Answer :
Let Principle is = P.Then S.I = P and Time = 4 years.
S.I. = ( PRT/100 ).
So, R = ( 100X P / P X T ) %.
R = 25%


Example 2:
What is the rate of p.c.p.a ? If the simple interest accrued on amount of Rs.25500 at the end of 3 years is 9180.
Answer :
we know the formula is S.I = PRT / 100
So, S.I = 9180 , P = 25500 , T = 3 years , R = ?
9180 = 25500 x R x 3 / 100
R = 9180 / 765 = 12 %
So rate of p.c.p.a = 12 %


Example 3:
If the Simple interest accrued in 8 years on a principal of Rs.40,000/- is 8000 of the principal. What is the rate of simple interest p.c.p.a?
Answer :
SI = PRT / 100
Let the rate of simple interest is x
So, x = 100 x 8000 / 40000 x 8
x = 2.5
So the rate of simple interest is 2.5.


Example 4:
A sum of money is in double in 12 years At what rate percent per annul.
Answer :
Let Principle = P. Then S.I = P and T is given 12 years.
Rate = ( 100 X P / P X 12 ) = 8.33%
So R = 8.33 %