Calculate Simple Interest

How to calculate Simple Interest?

To find Simple Interest, SI [Interest] = (P x R x T) / 100
To find Simple Principal, P [sum] = (SI x 100) / (R x T)
To find Simple Rate of Interest, R [Rate/year] = (SI x 100) / (P x T)
To find Simple Time Duration, T [Time] = (SI x 100) / (P x R)
where,
SI = Simple Interest
P = Principal or Initial amount
R = % Rate of interest per annum
T = Time Duration