To get the brand of best buy we will calculate the cost of printing of one page of each brand. Brand having the least cost will be the preferred one to buy.
Since, Brand A has the least printing cost, it will be the brand of best buy.
Brand A
Cost of printing = [tex]\frac{\text{Total cost of ink cartridge}}{\text{Number of pages}}[/tex]
= [tex]\frac{20}{200}[/tex]
= $0.10 per page
Brand B
Cost of printing = [tex]\frac{25}{125}[/tex]
= $0.2 per page
Brand C
Cost of printing = [tex]\frac{30}{150}[/tex]
= $0.2 per page
Brand D
Cost of printing = [tex]\frac{35}{250}[/tex]
= $0.14 per page
Since, least printing price of one page is $0.10
Therefore, brand A will be the best buy.
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