class

13
Jun
Examples 16 to 22

(16) (i) If the diameter of  a circle increases by 30%, its circumference will increase by how many percentage ?

 (ii) In above example area of  the circle will increase by how many percent ?

Soln.

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13
Jun
Examples 11 to 15

(11) The value of  a machine depreciates at the rate of  10 %  per annum. If its present value is Rs. 8100, what will be its worth after 2 years ?  What was the value of  the machine  2 years ago ?

Soln.

Value of  the machine a…

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13
Jun
Examples 6 to 10

(6)  What percent is :

(i)  120 of  80                  (ii) 125  ml. of  7.5   litres                 (iii)   10 gm of  1 kg  ?

Soln. (i) Let,  x  %  of   80   =  120

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13
Jun
Examples 1 to 5

(1) Express each one of  the following as a fraction :

(i)  55   %        (ii) 0.3   %        (iii) 0.08   %

(i) 55  %   =  \frac{55}{100}

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13
Jun
Per-thousand

Per-thousand  :  

l     =     Per-thousand      =   \frac{1}{1000}

 i.e.  x  l   =

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13
Jun
Introduction

Percent  :  

%    =    Percent   =    per hundred    =    \frac{1}{100} 

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12
Jun
Examples 6 to 8

(6) Prove that any date in March of  a year is the same day of  the week as the corresponding date in November that year.

Soln. Since, the no. of  odd days between 1st March to 1st November is 0 (

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