Question

The cost price of 10 articles is equal to the selling price of 9 articles find the gain per cent​

Answer 1

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Answer 2

Answer:

let the cp be x

cp of 10 pens =10x

atq cp of 10pen=sp of 9 pens

sp sp of 9 pens = 10x

therefore sp of 1 pen= 10x/9

cp of 1 pen= x

therefore profit = 10x/9-x=(10x-9x)/9

x/9

profit%= (profit/cp)*100

=

$\frac{x}{9 \times x} \times 100 \\ \\ = 100 \div 9 \\ = 11.11$