Question: if the selling price of 50 articles is equal to the cost price of 45 articles , then the loss or gain percent is :
A) 45 %
B) 10 %
C) 20 %
D) 60 %
E) 56 %
Correct answer: b
Grade: 7 | Topic: Ratios and proportions | Difficulty: Medium | Standard: 7.RP.A.3