Answer: 20 dollars
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Step-by-step explanation:
I'm assuming you meant to write $10,600 instead of $10,6000.
We'll replace y with this value and solve for x.

Use the quadratic formula with a = -1, b = 50, c = -600

We go for the smaller x value because the question asks "what is the least amount she can raise the price?".
If she raises the price by $20, then she would estimate to make about $10,600.