Verify the correct answer! and why !

Ijust need to see how to do this. so you don’t have to answer all of them just a step by step explanation of one.

Each cookie sells for $0.50 sam spent $90 on baking supplies and each cookie cost $0.25 to make how many cookies does sam need to sell before making a profit formula: sales> cost

I’m really confused and need your assist me with this question i’ve never been taught