Tom decides to take 10 dance lessons that cost $10 each, but he gets two of them for free. How much does he pay?
Let's think: He paid for 10 - 2 = 8 lessons. That means he pays 8 * $10 = $80.. The answer is: 80.

A small theater company sells tickets to a show. They have a 400 seat theater and fill to 80% capacity. Each ticket cost $30. They repeated the same performance 2 other days. How much did they make?
Let's think: They sold 400 * .8 = 320 tickets each day. So each day they made 320 * 30 = $9600. They did 2 + 1 = 3 days. So they made 9600 * 3 = $28,800.. The answer is: 28800.

The cost of Joe's new HVAC system is $20,000. It includes 2 conditioning zones, each with 5 vents. In dollars, what is the cost of the system per vent?
Let's think: Two zones with 5 vents per zone is 2 * 5 = 10 vents. Thus, the $20,000 system costs $20,000 / 10 = $2,000 per vent.. The answer is: 2000.

Emily makes $1,000,000 per year. If she has 10 employees who make $20,000 per year, how much would her salary be if she took part of her salary to make sure all of her employees make $35,000 per year.
Let's think:
Each employee needs $35,000 - $20,000 = $15,000 more per year. In total, Emily needs to pay $15,000 * 10 = $150,000 extra. Emily will need to have a new salary of $1,000,000 - $150,000 = $850,000 per year.. The answer is: 850000.