In this problem, 
and its graph are given. Use the graph of 
to determine where 
is concave down. 
Definitions:
Total Asset Turnover
A financial metric that measures the efficiency of a company's use of its assets in generating sales revenue.
Inventory Turnover
An index that measures how often a firm's inventory is sold out and resupplied over a set period.
Debt Ratio
A financial ratio that measures the proportion of a company's total debt to its total assets, indicating leverage and financial health.
Days' Sales in Inventory
A financial metric that indicates the average time in days that a company takes to turn its inventory into sales.
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