Applications of the derivative | Business & Finance homework help

The two graphs attached show the relationship between the number of items sold per week vs number of weeks since the item arrived at the store.  Although both graphs show sales are increasing per week, the graphs look different.
Discuss the following in terms of concepts in this chapter. ( Applications of the Derivative  )

If you were the store manager, which item would you order more of during week 9 and why?  

 I attached graphs here. 

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