MCQ - 52-1430

Correct Answer: A

Explanation:

To find percent change, subtract the "old" amount from the "new" amount, then divide the result by the "old" amount. The result is a percent increase if positive and a percent decrease if negative. In this case, don't forget x:

${\displaystyle T_{change}=100\cdot <!--\; \cdot \; -->\frac{T_2-<!--\; -\; -->T_1}{T_1}=100\cdot <!--\; \cdot \; -->\frac{.40x-<!--\; -\; -->.18x}{.18x}=122.22\mathrm{\%<!--\; \%\; -->}\approx <!--\; \approx \; -->122\mathrm{\%<!--\; \%\; -->}}$