book Maths Puzzle Numerical Ability

I have broken this down into the chart recommended by the book but I can't figure out how the numbers plug into the formula form.I have tried pluging in the numbers several differe

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What is the answer to An 8-ounce bottle of lotion costs $4.50. What is the cost per ounce? A contractor mixed two batches of concrete that were 9.3 and 11.3 percent cement to obtain 4500 lb of concrete that was 10.8 percent cement. How many pounds of each type of concrete was used?