Information About Cheng Corporation Is as Follows -Refer to the Figure

Multiple Choice

Information about Cheng Corporation is as follows:
$\begin{array}{lrr}&20 \times 1 & 20 \times 2\\\text { Output (units) } & 14,000 & 15,000 \\\text { Selling price per unit } & \$ 16 & \$ 16 \\\text { Input quantities: } & & \\\quad \text { Materials (kg) } & 1,750 & 1,900 \\\text { Labour (hours) } & 1,400 & 1,525 \\\text { Input prices: } & & \\\quad \text { Materials (per kg) } & \$ 3 & \$ 4 \\\quad \text { Labour (per hour) } & \$ 6 & \$ 7\end{array}$
-Refer to the figure.By how much did profits change as a result of changes in productivity related to materials?

A) $600 decrease
B) $600 increase
C) $100 decrease
D) $100 increase