Usually bulk buying is cheaper
It is difficult and expensive to refine anything to 100% purity. Best to use 70% as it is just as effective and cost a whole lot less.
Because the concentration of alcohol is lower; you pay the alcohol not the water.
Benjamin Franklin Isherwood
40 out of 80=40/80=.5 .5 is 50 percent, and larger than 40 percent.
40 is higher than 40%.
Fertilization
60%.
fertile material
20% of 40 is not greater than 40% of 20. The two are equal. 20% of 40 = 0.20 * 40 = 8 40% of 20 = 0.40 * 20 = 8
less than 40 percent
less than 40 percent
40 + 15% = 40*1.15 = 46