Quantitative Aptitude Free-Study Notes
15.
SIMPLE INTEREST
A.
Principal:
The money borrowed or lent out for a certain period is called the principal or the sum.
B.
Interest:
Extra money paid for using other's money is called interest.
C. Simple Interest (S.I.) :
If the interest on a sum borrowed for a certain period is reckoned uniformly, then it is called simple interest.
Let Principal = P, Rate = R% per annum (p.a.) and Time = T years. Then,
(i) S.I. = (P*R*T ) / 100
(ii) P=(100*S.I) / (R*T) ;R=(100*S.I) / (P*T) and T=(100*S.I) / (P*R)