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?

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.

The answer is 323 g.