Yogurt cups have a regular selling price of $0.55 each. The grocery store is having a sale and all yogurt cups are 3 for $1. What is the markdown on a
single cup if you take advantage of the sale?

The marked price of an article is 25% above its selling price and the cost price is 30% less than its marked price . find the discount percent and gain percent. only a brainlest can solve it i will mark you brainlest