The brand of cartridge which is the best buy us the brand with the lowest unit price which is brand A.
<h3>Unit price</h3>
Brand A
Cost = $20
pages = 200
Unit price = $20/200
= $0.1 per page
Brand B:
Cost = $25
Pages = 125
Unit price = $25/125
= $0.2 per page
Brand C:
Cost = $30
Pages = 150
Unit price = $30 / 150
= $0.2 per page
Brand D:
Cost = $35
Pages = 250
Unit price = $35 / 250
= $0.14 per page
Therefore, the brand of cartridge which is the best buy us the brand with the lowest unit price which is brand A.
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7 goes into 19 2 complete times. 7*2=14, but 7*3=21
the true answer is a decimal, one around 2.71
45+(45*.15)=
45+6.75=51.75
6.75 is the tip, 51.75 is the total bill
