The equation that relates total cost is C = $250 + $1.25n
The cost of printing 2500 brochures is $3,375.
The number of brochures that can be printed with $625 is 300.
Fixed cost is the cost that remains constant regardless of the brochures made. Variable cost increases with brochures made. Total cost is the sum of fixed cost and variable cost.
Total cost = fixed cost + variable cost
C = $250 + $1.25n
C = $250 + $1.25(2500)
= $3,375
625 = $250 + $1.25n
625 - $250 = $1.25n
375 = $1.25n
n = 300
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