Woody's widget shop has the following information: the average widget has a salesprice of $18; raw materials for the widget are $4, and it takes 30 minutes to assemble one widget. production labor is paid $8 per hour. operating expenses are as follows: salaries, $2,500 per week; insurance, $1,200 per quarter; rent, $3,000 per month and utilities, $1,000 per month. how many widgets must be sold each month in order to break even?