MCQ practice · SSC General Mathematics Board questions · Chapter 3: Algebraic Expressions
An article is sold at a 20% loss. Which one is the ratio of the cost price to the selling price?
Think it through first, then pick an option.
- a 4 : 5
- b 5 : 4
- c 5 : 6
- d 6 : 5
Answer and explanation
Correct answer: b 5 : 4
S = C(1 − 0.2) = 0.8C, so C : S = 1 : 0.8 = 5 : 4.
Why the other options are wrong
- a 4 : 5: 4 : 5 is selling price : cost price; the question puts the cost price first.
- c 5 : 6: 5 : 6 is what a 20% profit gives (C : S = 1 : 1.2).
- d 6 : 5: 6 : 5 is selling price : cost price for a profit.
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