'If the cost price of 10 articles is equal to the selling price of 7 articles, then the gain

"If the cost price of
10 articles is equal to the selling price of 7 articles, then the gain or
loss percent is
`35 %\\ los s`
b. `42 6/7%\\ los s`
c. `42 6/7%\\ los s`
d. `51 %\\ ga in`"

articles,