Formula to calculate simple interest :

SI [Interest] = (PRT)/100

P [sum] = (SI100)/(RT)

R [Rate/year] = (SI100)/(PT)

T [Time] = (SI100)/(PR)

where,
S.I. = Simple Interest
P = Principal or Sum of amount
R = % Rate per annum
T = Time Span


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Source : Easycalculation