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| rev | Admin | (Created page with "'''Solution: C''' Let X represent individual expense. Then, <math display = "block"> Y = \begin{cases} 0, \, 200 \leq X \leq 400 \\ X-400, \, 400 < X < 900 \quad \textrm{and...") | May 8'23 at 23:50 | +1,026 |