A 6-yard roll of tape costs $0.78. What is the unit price?

To find the unit price, we need to divide the total cost by the number of units.

Total cost = $0.78
Number of units = 6 yards

Unit price = Total cost / Number of units
Unit price = $0.78 / 6 yards
Unit price = $0.13 per yard

Therefore, the unit price of the tape is $0.13 per yard.