Castle Incorporated has the following information about three costs, A$,$ B$,$ and C:

$\backslash$table$[[,$Month,Amount,Units$],[$Cost A$,$January,$$78,000,62,400],[$February$,$$$109,200,124,800]]$

$\backslash$table$[[,$Month,Amount,Units$],[$Cost B$,$January,$$39,000,40,000],[$February$,$$$39,000,80,000]]$

$\backslash$table$[[,$Month,Amount,Units$],[$Cost C$,$January,$$76,000,152,000],[$February$,$$$152,000,304,000]]$

Required:

Indicate whether these costs are variable, fixed, or mixed.

$\backslash$table$[[CostA,],[CostB,],[CostC,]]$