Archive for 07/27/15

True Discount - Important Formulae

IMPORTANT CONCEPTS Suppose a man has to pay Rs. 156 after 4 years and the rate of interest is 14% per annum. Clearly, Rs. 100 at 14% wil...

Races: A contest of speed in running, riding, driving, sailing or rowing is called a race. Race Course: The ground or path on which ...

Downstream/Upstream: In water, the direction along the stream is called downstream . And, the direction against the stream is called ...

Ratio: The ratio of two quantities a and b in the same units, is the fraction and we write it as a : b . In the ratio a : ...

'BODMAS' Rule: This rule depicts the correct sequence in which the operations are to be executed, so as to find out the value o...

Some Basic Formulae: ( a + b )( a - b ) = ( a 2 - b 2 ) ( a + b ) 2 = ( a 2 + b 2 + 2 ab ) ( a - b ) 2 = ( a 2 + ...

CUBOID Let length = l , breadth = b and height = h units. Then Volume = ( l x b x h ) cubic units. Surface area = 2( l...

Minute Spaces: The face or dial of watch is a circle whose circumference is divided into 60 equal parts, called minute spaces. Hour H...

Concept of Percentage: By a certain percent , we mean that many hundredths. Thus, x percent means x hundredths, written as x %....

Let Principal = P, Rate = R% per annum, Time = n years. When interest is compound Annually: Amount = P 1 + R n 100 When in...