



 
Hi Susan, Let's do it the other way around. Suppose you knew the price was $2.00 per pound and you were to get a 25% discount, then you would only pay 75% of the $2.00 per pound. So the after sale price you get using the calculation
0.75 × $2.00 = $1.50 so the sale price is $1.50 per pound. But you know the sale price, it's $1.00 per pound so whoever calculated this performed the calculation
If you now divide both sides by 0.75 you get
Penny  


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