Using your extensive mathematical genius, solve the following problems.

1.	A bicycle store costs $2400 per month to operate. The store pays an average of $60 per bike. The average selling price of each bicycle is $120. How many bicycles must the store sell each month to break even?
2.	Several students decide to start a T-shirt company, After initial expenses for $280, they purchase each T-shirt wholesale for $3.99. They sell each T-shirt for $10.99. How many must they sell to break even?
3.	Producing a Musical costs $88,000 plus $5900 per performance. One sold-out performance earns $7500 in revenue. If every performance sells out, how many performances are needed to break even?
4.	If net revenue equals $50,000, cost of sales $20,000 and operating expenses $10,000, then what does the gross profit come to?
5.	A shipment of 1500 heads of cabbage each of which was approximately the same size was purchased for $600. The day the shipment arrived 2/3 heads were sold, each at 25 percent above the cost per head. The following day the rest were sold at the price per head equal to the 10 percent less than the price each head sold for one day before. What was the gross profit on this shipment?