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Parin Sir > math

Jun

☼ Trade Discount ( or Discount ) : The reduction made on the marked price of an article is called as Trade Discount.

If discount is given, then selling price is different than marked price. It is also calle…

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Jun

Loss

☼ Loss : If S.P. < C.P., the seller is said to have incurred a loss.

Loss = C.P. – S.P.

Loss or gain is always reckoned on C.P.

( i.e. On calculating gain or loss C.P. is taken as 100 % )

When a per…

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Jun

Profit And Loss

☼ Cost Price : The price at which an article is purchased, is called its cost price. Symbolically it is written as C.P.

☼ Selling Price : The price at which an article is sold, is called it…

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Jun

Index

00. Introduction

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Jun

Index

01. Introduction

02. Per-thousand

03. Examples 1 to 5

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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.

Posted in: Examples 16 to 22,

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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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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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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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Jun

Per-thousand

☼ Per-thousand :

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

i.e. x l =

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