I need help with this cvp question

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 $800 per month, and wages amount to $2400 per month. Variable costs consist of supplies and sandwich ingredients that cost $2.39 per sub sandwich. The subs are to be sold at a price of $5.29 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 $0.25 per sandwich, how many sandwiches must it sell to break even? (c) If the rent increases by 12%, what would the profit be if the shop sold 1561 units? (d) If the sandwich price was reduced by $0.25, how many sandwiches must the shop sell to make $1191 profit? (a) The shop must sell - | sandwiches to break even. Round up to the nearest whole number.) (b) If variable costs increase by $0.25 per sandwich, the number of sandwiches required to break even is |- Round up to the nearest whole number.) (c) If the rent increased by 12% and the shop sold 1561 units, the shop would make a(n) $ - profit. (Round to the nearest cent as needed.) (d) If the selling price of $5.29 is reduced by $0.25 and a profit of $1191 is required, then the number of sandwiches that needs to be sold is |-. (Round up to the nearest whole number.)