Question
If the cost price of 9 pens is equal to the selling
price of 11 pens, then what is gain or loss percentage?Solution
Let the Cost Price (CP) of 1 pen = ₹1
Then, CP of 9 pens = ₹9
Given: SP of 11 pens = ₹9
So, SP of 1 pen = ₹9 ÷ 11 = ₹9/11
CP of 1 pen = ₹1
SP of 1 pen = ₹9/11 ≈ ₹0.818
Loss = CP – SP = 1 – 9/11 = 2/ 11 ​
Loss % = (2/11) × 100 = 18.18%
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