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D=100-2p, p is the price in dollars of the product and D is the number of products that can be sold at that price.
What price should be set in order to set in order to sell 75 items?



Answer :

D=100-2p
P=price
D=products sold
in this case, the number of products you would want to sell is 75 so->
1)   75=100-2p             
2)   75+2p=100   
3)   100-75=2p
4)   25=2p
5)  25/2=p
6)  p=12.50

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