At a restaurant, hot chocolate can be purchased in two different cup sizes. A 12-ounce cup costs $2.40 and a 16-ounce cup costs $3.20.
Is the linear relationship between cup size and cost also proportional? Why or why not?
a Yes, there is no constant of proportionality.
b No, the constant of proportionality is 0.2.
c Yes, the constant of proportionality is 0.2.
d No, there is no constant of proportionality.