To do this, we must set up ratios:
Option One:
\(\frac{2.30}{250g} \\ \frac{0.0092}{1g} \\ 0.0092/g\)
The first options costs only $0.0092/gram (a fraction of a penny)!
Option Two:
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The second option costs only $0.0085/gram (cheaper than option one)!
Option Three:
This requires a little more work. First, we have to convert the grams into kilograms. For every 1 kg, there is 1,000 g. Therefore, 1,000g costs $5.65. Next, we set up the ratio as usual:
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The third option costs $0.00565/gram.
Therefore, option three is the cheapest!
Hope this helps!
