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# SIMPLE & COMPOUND INTERESTS

Aptitude & Reasoning

SIMPLE & COMPOUND INTERESTS

SIMPLE INTEREST
S. I = PTR / 100

S. I = Simple interest
P = principal
T = time in years
R = rate of interest
A = P + S. I
A = total amount
COMPOUND INTEREST
C. I = P × (1 + R/100)^T − P
C.I = Compound interest
P = principal
T = time in years
R = rate of interest
A = P + C. I
A = Total amount
Compound interest for half yearly
C. I = P × (1 +R/(2*100))^2T – P

Compound interest for quarterly
C. I = P × (1 +R/(4*100))^4T – P

When T = 2 years, R = any rate of interest
C. I – S. I = PR^2 / 100^2

When T = 3 years, R = any rate of interest
C. I – S. I = PR^2 (300 + R) / 100^3

comp

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