If a minimum wage for teenagers is set at $7 an hour,
a. How many hours do teenagers work and how many hours are unemployed?
b. Demand for teenage labor increases by 500 hours a month. What is the wage rate paid to teenagers and how many hours of teenage labor are unemployed?
The table gives the demand and supply schedules of teenage labor.

Wage rate (dollars per hour) Quantity demanded Quantity supplied (hours per month 3,000 2,500 2,000 1,500 1,000 1,000 1,500 2,000 2,500 3,000 6