Let the Cost Price (CP) be $100$. This assumption simplifies percentage calculations.
The shopkeeper adds 20% on the cost price to set the marked price.
MP = CP + (20\% \times \text{CP})
MP = 100 + (\frac{20}{100} \times 100)
MP = 100 + 20 = 120
A discount of 20% is given on the marked price.
Discount Amount = 20\% \times \text{MP}
Discount Amount = \frac{20}{100} \times 120 = 24
SP = MP - \text{Discount Amount}
SP = 120 - 24 = 96
Compare the Selling Price (SP) with the Cost Price (CP).
Since SP < CP, there is a loss.
Loss = CP - SP
Loss = 100 - 96 = 4
Loss Percent = \left( \frac{\text{Loss}}{\text{CP}} \right) \times 100
Loss Percent = \left( \frac{4}{100} \right) \times 100 = 4\%
Therefore, the shopkeeper incurred a 4% loss.
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