The phone bill for a company consists of both fixed and variable costs. Refer to the fourminus$$month data below and apply the highminus$$low method to answer the question.

Minutes

Total Bill

January

$480$

$$3,500$

February

$210$

$$2,695$

March

$180$

$$2,640$

April

$300$

$$2,875$

What is the variable cost per$$ minute? $($Round your answer to the nearest$$ cent.$)$