What is the unit form of 7÷4

Olivia uses the work below to determine 55% of 720 which explains the error in olivia’s solution

Gail is making costumes for a school play. each rabbit costume needs one and one half yards of white fur fabric, a yard of blue striped fabric, and a quarter of a yard of pink felt for the ears. g? ail needs to make eight rabbit man yards will she need, for the white fur fabric, blue striped fabric, and pink felt?

Bring the fraction a/a-4 to a denominator of 16-a^2