Division A makes a part that it sells to customers outside of the company. Data concerning this part appear below:

Selling price to outside customers $81

Variable cost per unit 56

Total fixed costs $434,000

Capacity in units 31,000

Division B of the same company would like to use the part manufactured by Division A in one of its products. Division B currently purchases a similar part made by an outside company for $75 per unit and would substitute the part made by Division A. Division B requires 5,600 units of the part each period. Division A can already sell all of the units it can produce on the outside market. What should be the lowest acceptable transfer price from the perspective of Division A?