\sum 0.2 = 0.4
Solve for Σ_0
Σ_{0}=2
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Σ_{0}=\frac{0.4}{0.2}
Divide both sides by 0.2.
Σ_{0}=\frac{4}{2}
Expand \frac{0.4}{0.2} by multiplying both numerator and the denominator by 10.
Σ_{0}=2
Divide 4 by 2 to get 2.
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