Simple Interest

what is interest, principal and Simple Interest?

Interest:

Extra money paid for using other's money is called interest.

principal:

The money borrowed or lent out for a certain period is called the principal or the sum.

Simple Interest (S.I.):

1.  Simple Interest  $$=\left(\frac{\mathrm{P} \times \mathrm{R} \times \mathrm{T}}{100}\right)$$
2. $$P=\left(\frac{100 \times S .I .}{R \times T}\right)$$
3. $$R=\left(\frac{100 \times S .1 .}{P \times T}\right)$$
4. and T= $$\mathrm{T}=\left(\frac{100 \times \mathrm{S.l.}}{\mathrm{P} \times \mathrm{R}}\right)$$