Suppose you want to buy rice. Different size packages cost different amounts, but the relationship is not always linear. That is, a bag twice as big does not usually cost twice as much. The chart shows the prices for various sizes of bags of rice.
Find the rates in cost per pound. (Stores refer to this as unit pricing.)
Divide the cost by the pounds for each row.
Does the unit price increase or decrease with the size of the bag?
The unit price decreases as the size of the bag decreases.
Does the rate change more drastically for smaller sizes or for larger sizes?
The rate change is more drastic in the smaller sizes. Note: Sketching a graph of rate with respect to bag size may help here.