Please answer ALL questions, and provide detailed explanations.

Smith Grape Co. operates in a perfectly competitive, constant-cost, resource and product market. Grapes sell for $5 per crate, workers can be hired at a wage of $50 each, and fixed costs are $60. Use the chart below to answer questions 18 23: Number of Workers Total Revenue Product $50 $110 $185 $285 18. What is the MRC of the 6th worker? 19. What is the MRP of the 6th worker? 20. What is the Marginal Physical Product (MPP) of the 2nd worker? 21. What is the Marginal Physical Product (MPP) of the 7th worker? 22. How many workers should the Smith Grape Co. hire if it wishes to maximize profits? 23. If the Smith Grape Co. hires 6 workers, how much will it earn in profit