Green T$-$Shirt Processing has a unit sales price of $$20$ for their $t-$shirt. The contribution margin percentage is $70\%$ and fixed costs totaled $$10,000.$

Green T$-$Shirt Processing incurs only fixed and variable costs in its operations. When $10,000$ T$-$shirts are produced, the company's managerlal accountant noted a fixed cost per shirt of $$1\mathrm{.}00$ and a variable cost per pot of $$6\mathrm{.}00.$

If production is expected to increase, which of the following statements is true?

Select one:

a$.$ The fixed cost per T$-$shirt will not change; the variable cost per T$-$shirt will decrease.

b$.$ Total fixed costs will decrease; the variable cost per T$-$shirt will not change.

c$.$ The fixed cost per T$-$shirt will decrease; the variable cost per T$-$shirt will increase.

d$.$ Total fixed costs will remain unchanged; total variable costs will increase.