Microeconomics Question. Please help!?

Coffee king Starbucks raises its prices
Starbucks will raise its price because the wholesale price of milk has risen by nearly 70% in the past year. There’s a lot of milk in those Starbucks lattes, noted John Glass, CIBC World Markets restaurant analyst.
Source: USA Today, July 24, 2007
a.Is the cost of milk a fixed cost or a variable cost?
b.Describe how the increase in the price of milk changes Starbucks’ short-run
-total cost
-total variable cost
-total fixed cost
-marginal cost

a. it is variable cost.It will change with the cups of latte.
b. It will increase total cost. Since total cost= fixed cost+variable cost.
- total variable cost will increase.
- total fixed cost will stay put.
- marginal cost will shift upward.

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