Got these wrong, can someone show how to do this with work?

California Gardens, Inc., prewashes, shreds, and distributes a variety of salad mixes in 2-pound bags. Doug Voss, Operations VP, is considering a new Hi-Speed shredder to replace the old machine, referred to in the shop as "Clunker." Hi-Speed will have a fixed cost of $75,000 per month and a variable cost of $1.45 per bag, Clunker has a fixed cost of only $48,000 per month, but a variable cost of $1.85. Selling price is $2.90 per bag, a) What is the crossover point in units (point of indifference) for the processes? The crossover point is 67,500 units. (Round your response to the nearest whole number.) b) What is the monthly profit or loss if the company changes to the Hi-Speed shredder and sells 50,000 bags per month? The monthly profit or loss if the company changes to the Hi-Speed shredder and sells 50,000 bags per month is $ - 2,500 (Round your response to the nearest dollar and include a minus sign if necessary.) c) What is the monthly profit or loss if the company stays with Clunker and sells 50,000 bags per month? The monthly profit or loss if the company stays with Clunker and sells 50,000 bags per month is $ 4,500 (Round your response to the nearest dollar and include a minus sign if necessary.) California Gardens, Inc., prewashes, shreds, and distributes a variety of salad mixes in 2-pound bags. Doug Voss, Operations VP, is considering a new Hi-Speed shredder to replace the old machine, referred to in the shop as "Clunker." Hi-Speed will have a fixed cost of $75,000 per month and a variable cost of $1.45 per bag, Clunker has a fixed cost of only $48,000 per month, but a variable cost of $1.85. Selling price is $2.90 per bag, a) What is the crossover point in units (point of indifference) for the processes? The crossover point is 67,500 units. (Round your response to the nearest whole number.) b) What is the monthly profit or loss if the company changes to the Hi-Speed shredder and sells 50,000 bags per month? The monthly profit or loss if the company changes to the Hi-Speed shredder and sells 50,000 bags per month is $ - 2,500 (Round your response to the nearest dollar and include a minus sign if necessary.) c) What is the monthly profit or loss if the company stays with Clunker and sells 50,000 bags per month? The monthly profit or loss if the company stays with Clunker and sells 50,000 bags per month is $ 4,500 (Round your response to the nearest dollar and include a minus sign if necessary.)