Solve for Y
Y\geq 500
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20Y\geq 9600+400
Add 400 to both sides.
20Y\geq 10000
Add 9600 and 400 to get 10000.
Y\geq \frac{10000}{20}
Divide both sides by 20. Since 20 is positive, the inequality direction remains the same.
Y\geq 500
Divide 10000 by 20 to get 500.
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