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p is the principal
n is the time
r is the rate of interest
Example: Find the simple interest of Rs. 500 in 2 years at the rate of 10% per annum.
Solution: Given P = 500, n = 2, r = 10
Simple Interest = (p*n*r)/100
= (500*2*10)/100
= 5*2*10
= Rs 100