A seller earns a profit of 10% after selling an object at 10% discount. What is the ratio of cost price to the printed price of the object?
Answer & explanation
Correct answer: option 3
The correct answer is Option (3) → 9 : 11
The selling price can be written two ways: from the printed price (less the 10% discount) and from the cost price (plus the 10% profit). Setting the two equal links cost price and printed price.
SP \(=0.9\times\) Printed price
SP \(=1.1\times\) Cost price
\(1.1\times\) CP \(=0.9\times\) PP, so CP : PP \(=0.9:1.1=9:11\)