Solve for a
a=\frac{1}{2000}=0.0005
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20=a\times 40000
Calculate 200 to the power of 2 and get 40000.
a\times 40000=20
Swap sides so that all variable terms are on the left hand side.
a=\frac{20}{40000}
Divide both sides by 40000.
a=\frac{1}{2000}
Reduce the fraction \frac{20}{40000} to lowest terms by extracting and canceling out 20.
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