pre cal 13 The table shows the number of CD players sold in

The table shows the number of CD players sold in a small electronics store in the years 1993 Year CD players sold 1993 - 2003. What was the average rate of change of sales between 1993 and 2003? What was the average rate of change of sales between 1993 and 1994? What was the average rate of change of sales between 1994 and 1996? Between which two successive years did CD player sales increase most quickly? CD player sales increased most quickly between and . Between which two successive years did CD player sales decrease most quickly? CD player sales decreased most quickly between and .

Solution

a) 1993 ---> 512 CD ; 2003 ---> 587 CD

Avg rate of change of sales = ( 587-512)/( 2003 -1993) = 7.5 units/year

b)1993 ---> 512 CD ; 1994 ---> 459 CD

Avg rate of change of sales = ( 512- 459)/( 1994 - 1993) = 53 units/year

c) 1994 ----> 459 CDs ; 1996 ----> 557 CDs

Avg rate of change of sales = ( 557-459) /( 1996 -1994)

=68/2 = 34 units/year

d) Looking at table we find: MaximimumaBetween 2001 -2002 --88units and 1996 -1997 ---> 86 units

So, 2001 and 2002