Question

A) What was the change of annual sales between the first year 2013, and the 2019 year’s (b) What is the average rate of change in sales for the 2019 year beginning in 2013?_____billion dollars per year

Answer 1

Given:

Sales in 2013 = 36.44 billions of dollars

Sales in 2019 = 38.16 billions of dollars

(a) Change of annual sales between 2013 and 2019

The change of annual sales between 2013 and 2019 is the difference between the annual sales in 2019 and the annual sales in 2013:

`\text{change of annual sales = sales in 2019 - sales in 2013}`

Substituting the given values:

`\begin{gathered} \text{change of annual sales = 38.16 - 36.44 } \\ =\text{ }1.72 \end{gathered}`

Hence, the change of annual sales is 1.72 billions dollars

(b) The average rate of change in sales for the 2019 year begining in 2013:

The average rate of change can be calculated using the formula:

`\begin{gathered} \text{Average rate of change = }\frac{sales\text{ in 2019 - sales in 2013}}{2019\text{ - 2013}} \\ =\text{ }\frac{1.72\text{ }}{6}\text{ } \\ =\text{ 0.287 billion dollars per year} \end{gathered}`

Hence, the average rate of change in sales for the 2019 year begining in 2013 is 0.287 billion dollars per year