Let's solve part (c) to calculate the change in sales between 2004 and 2008.

Given:

1. You already calculated the average rate of change in sales between 2004 and 2007 to be $274 million per year.
2. The percentage change in sales between 2007 and 2008 was -1.756%, indicating a decrease.

To find the change in sales between 2004 and 2008:

1. Determine Sales in 2004: Let $S_{2004}$ be the sales in 2004.
2. Determine Sales in 2007: You know the average rate of change between 2004 and 2007 was $274 million/year. Therefore, the sales in 2007 can be expressed as: $S_{2007} = S_{2004} + 3 \times 274$ This is because the time span from 2004 to 2007 is 3 years.
3. Determine Sales in 2008: Since the percentage decrease between 2007 and 2008 was -1.756%, the sales in 2008 can be calculated as: $S_{2008} = S_{2007} \times \left(1 - \frac{1.756}{100}\right)$
4. Calculate the change in sales between 2004 and 2008: The change in sales is: $\Delta S = S_{2008} - S_{2004}$

Now let's calculate it. Please provide the initial sales figure for 2004 if available, or we can solve it symbolically if the sales data is not explicitly provided.

Would you like to continue with this method, or do you have the sales data for 2004?