Problem Solving (PS) | Re: A store's monthly sales total declined j percent from October to Novem

First method (plug-in)

S=100 fall=20% so increase is 25% (20*100/80). Only Option E gives 25%

Second method

N=S*(1-J) D=S; Increase is S-S*(1-J)=S-S+SJ=SJ; % Increase = SJ/S*(1-J); S is eliminated to get J/(1-J) IMO E

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