Sub Stop, 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 $2500 per month. Variable costs consist of supplies and sandwich ingredients that cost $2.32 per sub sandwich. The subs are to be sold at a price of $5.72 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 13%, what would the profit be if the shop sold 1683 units? (d) If the sandwich price was reduced by $0.23, how many sandwiches must the shop sell to make $1170 profit