Find 3% of 100.? Pls help a person out thank you.

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

Solve for x: 5/3 x = 20/21 it's fraction. remember to simplify your fraction

Answer asap! urgent! will give brainliest!