Sianna bought 3 pens, 4 notebooks, and a calculator. The calculator cost $25. If x represents the cost of each pen and y represents the cost of each notebook, which expression represents the amount of change Sianna should receive from $50?
*3x + 4y + 25
*50 - (3x + 4y)
*50 - (3x + 4y + 25)
*3x + 4y + 25 + 50
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