To cost of the article is Rs-45.The cost was 1st increase by 20 Percent and later it was reduce 20 percent .the percent cost of article is
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cp=100%=45
now there are 2 rates so we have to convert them in single rate
there is a formula for single rate
A+-B+-A×B/100
20+(-20)+20×(-20)/100
20-20-400/100
0-4=-4
Here the loss is 4%
now go through percentage method
100%=45
if you will solve this then this type of equation will be
25%=45
24%=43.2
becase 45 is 1.8 multiplier of 25.
now there are 2 rates so we have to convert them in single rate
there is a formula for single rate
A+-B+-A×B/100
20+(-20)+20×(-20)/100
20-20-400/100
0-4=-4
Here the loss is 4%
now go through percentage method
100%=45
if you will solve this then this type of equation will be
25%=45
24%=43.2
becase 45 is 1.8 multiplier of 25.
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