QUESTION $15$

$(4$ Marks$)$

Imagine a small juice producer named "Bilberry Infused Beverages $"$ known for its refreshing beverages. The owner, Louis, keeps track of the production costs. Recently he decided to expand his operations and produce more Juices to meet the increasing demand. Table $15\mathrm{.}1$ below shows the data he has collected: Complete Table $15\mathrm{.}1$ below and use the information to answer the question that follows.

Table $15$:$1$ Production Costs for Bilberry Infused Beverages

$\backslash$table$[[$Output$,$Total cost,Fixed cost,$\backslash$table$[[$Variable$],[$cost$]],\backslash$table$[[$Marginal$],[$cost$]],\backslash$table$[[$Average$],[$cost$]],\backslash$table$[[$Average$],[$fixed cost$]]],[0,30,,0,,,],[1,,,10,,,],[2,,,18,,,],[3,,,22,,,],[4,56,,,,,6],[5,64,,,,,],[6,76,,,15,,],[7,,,,,15,],[8,,,,,,]]$

What is the marginal cost of producing the $8$ th unit of the good?

a$)4$

b$)10$

c$)12$

d$)29$