Find the cost per ounce of a sunscreen made from 150 oz of lotion that cost $3.46 per ounce and 70 oz of lotion that cost $14.68 per ounce.

Answer 1

If you take 150 oz of lotion 1 ($3.46/oz) and mix it with 70 oz of lotion 2 ($14.68/oz) you would end up with 150+70 or 220 total ounces. The cost would be 150*3.46 + 70*14.68 = $519.00 + $1027.60 = $1546.60.

The cost per ounce would then be $1546.60/220 = $7.03/oz