If the selling price of 7 article is equal to the cost price of 8 articles, then what is the profit percentage (correct to one decimal place)?

Answer: Option D

Selling price of 7 article is equal to cost price of 8 article
7 × Selling price = 8 × Cost price
$$\frac{\text{Cost price}}{\text{Selling price}}=\frac{7}{8}⟩+1$$
Profit = 8 - 7 = 1
Profit % $$=\frac{1}{7}\times 100=14.28\%\sim 14.3\%$$