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20 1 1 entrance examination paper of lingxi emerging school (olympiad)
100*0.5=5 (yuan) five yuan cheaper.

(5 * 4+80) * (100-5) =100 * 95 = 9500 (yuan)

Aunt Wang bought this after reducing the price, MINUS the original price:

9500-80 *100 = 9500-8000 =1500 (yuan)

This is extra money, but the profit is the same:

1500/20=75 (yuan) minus the extra purchase is the cost.

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