quantity of flour price
3 pounds $5.25
5 pounds $9.75
7 pounds $12.60
10 pounds $14.20
12 pounds $18.24

a baker purchases flour each week from a wholesale warehouse. the chart shows the quantities and prices available this week. if the caterer decides to buy the best deal, how much will he save per pound of flour over the most expensive deal?
a) $0.28
b) $0.37
c) $0.47
d) $0.53