if the cost of 20 pens is equal to the selling price of 30 pens,find the loss percent.
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CP of 20 pens = SP of 30 pens
let CP of 1 pen be Rs. 1
CP of 30 pens = Rs. 30
SP of 30 pens = CP of 20 pens = Rs. 20
CP is greater than SP
Loss = CP - SP = 30-20 = Rs. 10
Loss % = Loss/CP × 100
= 10/30 × 100 = 33.33%
let CP of 1 pen be Rs. 1
CP of 30 pens = Rs. 30
SP of 30 pens = CP of 20 pens = Rs. 20
CP is greater than SP
Loss = CP - SP = 30-20 = Rs. 10
Loss % = Loss/CP × 100
= 10/30 × 100 = 33.33%
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