If some articles are bought at Rs.10 each and sold at Rs.7 each, then what is the loss percentage? यदि कुछ वस्तुओं को प्रत्येक 10 रुपये में खरीदा जाता है और 7 रुपये में बेचा जाता है, तो हानि प्रतिशत क्या है?
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