CONDITION 1. :-
If the price of a commodity is increased by x % and its consumption is decreased by y % , then effect on revenue -
$\left \{ x-y-\frac{xy}{100} \right \}$
CONDITION 2. :-
If the price of a commodity is decreased by x % and its consumption is increased by y % , then, effect on revenue -
$\left \{ y-x-\frac{yx}{100} \right \}$
General formula for both the cases -
Increase % value - Decrease % value - $\frac{Inc.\, \%\, value\times Dec.\% \,value}{100}$
NOTE :- Value is increased or decreased, according to the positive or negative sign in the answer obtained.
For eg. If the price of car is decreased by 12 % and sale is increased by 10 % , then what will be the effect on income?
sol. % effect = 10 - 12 - $\frac{12\, \times\, 10}{100}$
= -2 - $\frac{12}{10}$
= -3.2 %
$\therefore$ income is decreased by 3.2 %.
If the price of a commodity is increased by x % and its consumption is decreased by y % , then effect on revenue -
$\left \{ x-y-\frac{xy}{100} \right \}$
CONDITION 2. :-
If the price of a commodity is decreased by x % and its consumption is increased by y % , then, effect on revenue -
$\left \{ y-x-\frac{yx}{100} \right \}$
General formula for both the cases -
Increase % value - Decrease % value - $\frac{Inc.\, \%\, value\times Dec.\% \,value}{100}$
NOTE :- Value is increased or decreased, according to the positive or negative sign in the answer obtained.
For eg. If the price of car is decreased by 12 % and sale is increased by 10 % , then what will be the effect on income?
sol. % effect = 10 - 12 - $\frac{12\, \times\, 10}{100}$
= -2 - $\frac{12}{10}$
= -3.2 %
$\therefore$ income is decreased by 3.2 %.
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