Respuesta :

mountaaindew
20 for $30 = 1 yard per $1.50
40 for $45 = 1 yard per $1.125 <<< best deal.
50 for $70 = 1 yard per $1.40
65 for $85 = 1 yard per $1.307
I believe 40 for 45 is the best one so b.