Theres a few questions at the beginning of the practice test I'm having trouble with. I'm doing good with the later questions but could really use some help with these.

Can anyone help? or if you are studying and also not completely sure do you know what chapter I can find this in?




2. Market demand is given as QD = 100 – 2P. Market supply is given as QS
= P + 10. Each identical firm has
MC = 10Q and ATC = 5Q. What quantity of output will a typical firm produce?
a. 3
b. 4
c. 10
d. 40
3. Market demand is given as QD = 100 – 2P. Market supply is given as QS
= P + 10. Each identical firm has
MC = 10Q and ATC = 5Q. What is a firm’s profit?
a. $15
b. $45
c. $75
d. $90
4. Market demand is given as QD = 100 – 2P. Market supply is given as QS
= P + 10. Each identical firm has
MC = 10Q and ATC = 5Q. How many firms are in this market?
a. 15
b. 13
c. 40
d. 30
5. Market demand is given as Qd = 100 – P. Market supply is given as Qs = 2P + 3. The government imposes a
sales tax on producers. A tax of $2/unit is placed on suppliers. What is the new after-tax supply curve?
a. Qs = 2P - 4
b. Qs = 2P -1
c. Qs = 2P + 1
d. Qs = 2P + 5