\textbf{For part (b)}:
\text{January Cups Sold: }850
\text{March Cups Sold: }587
\text{Price per Cup in March: }$1.98
\text{Revenue in March: }587 \times 1.98
\text{Revenue in March: }$1162.26
\textbf{For part (c)}:
\text{May Cups Sold: }387
\text{Price per Cup in May after Increase: }$2.25
\text{Revenue in May: }387 \times 2.25
\text{Revenue in May: }$871.25
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