Answer:
Perpendicular bisector theorem
Step-by-step explanation:
The illustration of the theorem is:
If point B is a perpendicular bisector of Line AC and the length of AC is 10cm
Then

Where
--- Perpendicular bisector
So, the equation becomes



Recall: 

32 + 0.33c = p
where c is every card more than 80 (so if you want 82 card c = 2)
and p is the total price
3/4 tons = 1500 lbs/pounds