3.3.2.2c - Formulae to calculate and understand the relationship between: • total cost • total

Formulae to calculate and understand the relationship between:; total cost; total fixed cost; total variable cost; average (total) cost; average fixed cost; average variable cost; marginal cost.

Use c - formulae to calculate and understand the relationship between: • total cost • total to connect the rule to the data and decision in the question.

This matters because c - formulae to calculate and understand the relationship between: • total cost • total determines what can be inferred or chosen; begin with the stated conditions and keep the conclusion tied to the evidence.

Example: apply c - formulae to calculate and understand the relationship between: • total cost • total to one small, clearly defined case, show the key step or comparison, and explain the result in words.

Boundary: use the formula and units given in the question, show the substitution and interpret the result; the calculation alone is not the conclusion.