Solve for a
a\leq 4
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3500a+1200a+1200\leq 20000
Use the distributive property to multiply 1200 by a+1.
4700a+1200\leq 20000
Combine 3500a and 1200a to get 4700a.
4700a\leq 20000-1200
Subtract 1200 from both sides.
4700a\leq 18800
Subtract 1200 from 20000 to get 18800.
a\leq \frac{18800}{4700}
Divide both sides by 4700. Since 4700 is positive, the inequality direction remains the same.
a\leq 4
Divide 18800 by 4700 to get 4.
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