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Step-by-step explanation:
let CP of the article be x.
Given that , loss%=20% & SP= ₹ 320
.•. Loss=₹(x - 320). [Loss = CP-SP]
By Formula ,
Loss%=( Loss ÷CP) ×100%
=> 20=[(x-320)÷x]×100
=> x=5x-1600
=> 4x=1600
=> x=400
.•. The CP of the article is ₹400.
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