I cant figure out what formula to use to get the average variable cost when neither fixed or variable cost is known and vice versa

AM Instrument Company manufactures miniature calculators, which it sells to a limited number of exclusive dealers.AM's normal production rate is 260 units per week at a total cost of $3,200.At full capacity it can produce 340 units per week at a total cost of $3,800.

What is the average variable cost per calculator?

What is the total fixed cost?