To find the percentage of wire that was used, we need to divide the length of the wire that was used by the total length of the wire, and then multiply by 100 to convert the result to a percentage.
The expression to calculate the percentage of wire used is:
percentage used = (length used / total length) × 100%
Substituting the given values, we get:
percentage used = (65 ft / 80 ft) × 100% ≈ 81.25%
Therefore, about 81.25% of the electrical wire was used.