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Find original from final after % change
Decimals representing % changes
Original=FinalMultiplier\text{Original} = \frac{\text{Final}}{\text{Multiplier}}Original=MultiplierFinal
(100%−percentage)÷100(100\% - \text{percentage}) \div 100(100%−percentage)÷100
(100%+percentage)÷100(100\% + \text{percentage}) \div 100(100%+percentage)÷100
0.80.80.8
1.051.051.05
Divide final amount by multiplier
Work forwards: original×multiplier=final\text{original} \times \text{multiplier} = \text{final}original×multiplier=final
Clear working with multiplier
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