If 20 units cost 1600 and 50 units cost 2500 what is the fixed cost? What is the variable cost per unit? What if 100 units cost 6000? What might be happening for that to be the case?

If 20 units cost 1600 and 50 units cost 2500 what is the fixed cost? What is the variable cost per unit? What if 100 units cost 6000 ? What might be happening for that to be the case