I need help with this question using excel GOAL SEEK FUNCTION step by step

Warner Clothing is considering the introduction of a new baseball cap for sales by local vendors. The company has collected the following price and cost characteristics: Sales price Variable costs Fixed costs $ 15 per unit 3 per unit 42,000 per month Required: Using the Goal Seek function in Microsoft Excel, prepare an Excel spreadsheet to answer the following questions: a. What number must Warner Clothing sell to break even? b. What number must Warner Clothing sell to make an operating profit of $9,000 per month