There are 6 packages that store 30 baseball cards. what is the number of cards per package? what is the constant of proportionality.(a.) 5 cards per package; the constant of proportionality is 5.(b.) 6 cards per package ; the constant of proportionality is 6.(c.) 24 cards per package ; the constant of proportionality is 24.(d.) 30 cards per package ; the constant of proportionality is 30.