Information About Taekwondo Corporation Is as Follows By How Much Did Profits Change as a Result of (units)

Information about Taekwondo Corporation is as follows: $\begin{array}{lcr}&2018&2019\\\text { Output (units) } & 14,000 & 15,000 \\\text { Selling price per unit } & \$ 16 & \$ 16\\\\\text { Input quantities: }\\\text { Materials (pounds) }&1,750&1,900\\\text { Labor (hours) }&1,400&1,525\\\\\text { Input prices: }\\\text { Materials (per pound) }&\$3&\$4\\\text { Labor (per hour) }&\$6&\$7\end{array}$ By how much did profits change as a result of changes in productivity related to materials?

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