on increasing the price of t v sets by 30 their..., Percentage, General Mathematics

Question:On increasing the price of T.V. sets by `30%`, their sale decreases by `20%` What is the effect on the revenue receipts of the shop ?

A `4%` increase 
B `4%` decrease 
C `8%` increase 
D `8%`decrease

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+ AnswerA

+ ExplanationLet cost per T.V. `= Rs. 100` &

original sale `= 100`T.V.

Revenue Receipt `= Rs. (100 xx 100)`.

New Receipt `= Rs. (130 xx 80) = Rs. 10400`.

Increase in receipt `= ((400)/(100 xx 100) xx 100)%`

`= 4%`

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