Question

one bottle of aspirin holds 250 tablets, each containing 150 mg of aspirin and sells for $2.95. Another bottle holds 125 tablets, each containing 200 mg of aspirin, and sells for $3.50. For each bottle, calculate the value in mg aspirin/$. Which bottle is the better bargain and why?

Answer 1

I bottle:

250 * 150mg = 37500mg

If 37500mg ------- cost -------  $2.95
so 1mg       ------- cost ------- x

x = 1mg* $2.95 / 37500mg =  $7,87*10⁻⁵ 

II bottle

125 * 200mg = 25000mg

If 25000mg ---------- cost ---------- $3.50
so 1mg       ---------- cost ---------- x

x = 1mg* $3.50 / 25000mg = $0,00014=$1,4*10⁻⁴


$7,87*10⁻⁵  < $1,4*10⁻⁴

1st bottle is better bargain cause 1mg of aspirin its cheaper than in 2nd.