From 2009 to 2010, Shamwow reported that its Net Sales increased from ($ 300,000) to ($ 400,000),

Question:

From 2009 to 2010, Shamwow reported that its Net Sales increased from $\$ 300,000$ to $\$ 400,000$, and its Gross Profit increased from $\$ 90,000$ to $\$ 130,000$. Was the Gross Profit increase caused by $(a)$ an increase in sales volume only, (b) an increase in gross profit per sale only, or (c) a combination of both? Explain your answer.

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