Can someone help me with these cvp questions

Sub Haven, 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 $1100 per month, and wages amount to $2000 per month. Variable costs consist of supplies and sandwich ingredients that cost $2.15 per sub sandwich. The subs are to be sold at a price of $5.77 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 $0.23 per sandwich, how many sandwiches must it sell to break even? (c) If the rent increases by 6%, what would the profit be if the shop sold 1637 units? (d) If the sandwich price was reduced by $0.23, how many sandwiches must the shop sell to make $782 profit? (a) The shop must sell - | sandwiches to break even. (Round up to the nearest whole number.) (b) If variable costs increase by $0.23 per sandwich, the number of sandwiches required to break even is - (Round up to the nearest whole number.) (c) If the rent increased by 6% and the shop sold 1637 units, the shop would make a(n) $ -| profit. (Round to the nearest cent as needed.) (d) If the selling price of $5.77 is reduced by $0.23 and a profit of $782 is required, then the number of sandwiches that needs to be sold is - (Round up to the nearest whole number.)Sheng's business budget included sales of $494,000 and xed cost of $61280. If the contribution margin for the business was $143,260, what are the sales needed to break even? The sales needed to break even are (Round to the nearest cent as needed. Round all intermediate values to six decimal places as needed.)