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The results of a survey considering the support for political parties $Y$ and $Z$ are presented in the table below. a) How many percentage points have the support for party $Y$ increased? b) How much has the percentage of people supporting party $Z$ decreased? $$\begin{array}{|ccc|}\hline & \text{February}& \text{March}\\ Y& 16\mathrm{\%}& 20\mathrm{\%}\\ Z& 10\mathrm{\%}& 8\mathrm{\%}\\ \hline\end{array}$$