Answer:
The answer is: A) price = $2.00, quantity supplied = 20 and price = $4.00, quantity supplied = 40.
Step-by-step explanation:
When the price of babysitting is $2 per hour, the combined quantity supplied of labor is 20 hours (12 hours + 8 hours).
If the price of babysitting increases to $4 per hour, the combined quantity supplied of labor will double to 40 hours (24 hours + 16 hours).