80 + x \% \cdot 80 = 100
Solve for x
x=25
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8000+x\times 80=10000
Multiply both sides of the equation by 100.
x\times 80=10000-8000
Subtract 8000 from both sides.
x\times 80=2000
Subtract 8000 from 10000 to get 2000.
x=\frac{2000}{80}
Divide both sides by 80.
x=25
Divide 2000 by 80 to get 25.
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