This is one question

a) She sells sea shells down by the seashore for seven shillings a shell. She spends sixty shillings on servicing her sea shell shack and six shillings per shell on searching for and shining her sea shells. She shall sell six hundred sea shells this summer (i.e. price = 7, marginal cost = 6, fixed costs = 60, quantity = 600).

What is her contribution margin?

A. $1/shell

B. $2/shell

C. $6/shell D. $7/shell

b) What are her total profits?

A. $1

B. $540

C. $3,600

D. $4,200

C ) If a sea shell shack costs $100, and if a second potential shack were to split the market evenly with her, she can expect:

A. To remain a monopoly (no entry by competitor)

B. To have competition (entry by competitor)

d) After the summer, Suzie saw 100 of her sea shells featured on glamorous Instagram accounts with a total following of 100,000 people. This will:

A. Do nothing

B. Give her a competitive advantage

C. Hurt her sea shell business