Question

In 1980, the average cost of a pack of cigarettes was $0.88. In 2000, the average cost was $5.31 per pack.

Answer 1

Answer:

The average rate of change of the cost of a pack is 22 cents per year.

Another name for the average rate of change is slope.

Step-by-step explanation:

The average rate of change of the cost of a pack ($r$), in monetary units per year, is equal to the change in the average cost of a pack ($\Delta c$), in monetary units, divided by the change in time ($\Delta t$), in years. Then, the average rate of change is:

$r = \frac{\ \,5.31-\ \,0.88}{2000-1980}$

$r = \ \,0.22\,\frac{1}{yr}$

The average rate of change of the cost of a pack is 22 cents per year.

Another name for the average rate of change is slope.