Answer:
60%
Explanation:
The article cost the store x.
The store raised the price to 14 naira and made 40% profit.
The selling price is 1.4x.
The selling price is 14 naira.
1.4x = 14
1.4x/1.4 = 14/1.4
x = 10
The store bought the article for 10 naira.
If the store sold the article for 16 naira, the profit would be 6 naira.
percent = part/whole × 100%
percent = 6/10 × 100%
percent = 60%