Can someone help me solve these cvp questions

Tina, an entrepreneurial business student, wants to set up a business completing tax forms for other students. Her price would be $46.00 for each job. Fixed expenses include $231.00 for the tax software which Tina would purchase. Tina would hire some accounting students to complete the forms, paying them for two hours at $10 per hour for each job. She would also have paper and supplies costs of $5 per job. How many jobs would she have to generate before she starts to make a profit? Make the assumption that it takes an accounting student two hours to complete one tax return. Tina would have to generate tax returns before she starts to make a profit. (Round up to the nearest unit.)Sub Place, a small sandwich store, is located on a busy corner near many other businesses. The shop's busiest time is during the mid-day period. Rent for the location is $900 per month, and wages amount to $2800 per month. Variable costs consist of supplies and sandwich ingredients that cost $2.03 per sub sandwich. The subs are to be sold at a price of $5.48 each. Answer each of the following independent questions. (a) How many sandwiches must the shop sell to break even? (b) If the shop increases variable costs by $0.24 per sandwich, how many sandwiches must it sell to break even? (c) If the rent increases by 8%, what would the profit be if the shop sold 1610 units? (d) If the sandwich price was reduced by $0.24, how many sandwiches must the shop sell to make $871 profit? (a) The shop must sell 1072 sandwiches to break even. (Round up to the nearest whole number.) (b) If variable costs increase by $0.24 per sandwich, the number of sandwiches required to break even is 1153 (Round up to the nearest whole number.) (c) If the rent increased by 8% and the shop sold 1610 units, the shop would make a(n) $ 1783 profit. (Round to the nearest cent as needed.) (d) If the selling price of $5.48 is reduced by $0.24 and a profit of $871 is required, then the number of sandwiches that needs to be sold is 1424 (Round up to the nearest whole number.)