其它
A store sells cakes for $10 each, at the following discounts.  \textbf{① $1 off each every Wednesday.}  \textbf{② Buy three or more, $1 off each.}  If both conditions are met at same time, the price can be reduced together.  How much will Tracy pay for 4 cakes at this store on Tuesday? 
Overseas Competition->Knowledge Point->Word Problem Modules->Word Problems in Economics->Money Calculation
40-1*4=36 