Hill Company Has Reported the Following Information on Their Income

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Hill Company has reported the following information on their income statements for the years 2008 through 2012:
$$\begin{array} { l r r r r r } & \underline { 2012 } & \underline { 2011 } & \underline { 2010 } & \underline { 2009 } & \underline { 2008 } \\\text { Net Sales } & \$ 11,332 & \$ 11,862 & \$ 11,170 & \$ 11,038 & \$ 9,932 \\\text { Cost of Goods Sold } & 7,815 & 8,321 & 8,191 & 7,710 & 6,892\end{array}$$ A.Compute the gross profit percentage for each year.
B.Has the gross profit ratio for Hill improved over time or worsened? Explain your answer.