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Chika's uncle makes perfect brownies. Chika noted how much sugar he uses based on how many batches he makes:$\newline$\begin{tabular}{lccc} $\newline$Number of batches & $2$ & $3$ & $4$ \\$\newline$\hline Sugar $(\mathrm{kg})$ & $0$.$6$ & $0$.$9$ & $1$.$2$$\newline$\end{tabular}$\newline$Chika has $2$.$25$ kg of sugar, and she wants to make as many batches as possible for a bake sale. She can make partial batches, and she has more than enough of the other ingredients.$\newline$How many batches can Chika make? $\qquad$$\newline$batches