when the price of product was decrease by 10%, the number sold increased by 30% what was the increase on the total revenue.

Answer :

Let Price of the product  = Rs 100 
So,
Price of the product after decrease of 10% = 100 - 10% of 100 = 100 - 10 × 100100  = 100 - 10 = Rs 90

Let he sold total number of product = 100
So,
Total number of product he sold after increase of 30% = 100 + 30%of100 = 100 + 30 × 100100 = 100 + 30 = 130 

He gets before any decrease of price and increase in number of product sold  = 100 × 100 = Rs 10,000 

Now he gets  = 90 × 130 = Rs 11,700 

So total gain in revenue = 11,700 - 10,000 = Rs 1700
SO,
Total revenue increase = 1700 × 10010000    = 17%                        

So,
Revenue increase by 17%                         ( Ans )

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20%

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