By selling 72 articles a loss equal to the selling price of 8 articles was incurred What is the loss...........

Explanation:

So let selling price (sp) of one article be x
then for 8 article 8x
and for 72 articles 72x
Cost price (cp) of 72 article is 72x+8x=80x
loss percentage(loss%)=loss/costprice×100
loss percentage = 8x / 80x ×100
loss percentage=10%

Hence option 3 is the correct answer.