This may seem stupid but can someone explain to me why 25% is written as .0025 in this equation?
How much wettable powder pesticide containing 40% active ingredient should be added to a 100-gallon tank if the recommended treatment is 0.25% concentrate by weight?
Pounds of pesticide to use = (0.0025 x 100 gallons x 8.34) /.40 = 5.2 lbs. pesticide needed
Shouldn’t it be written as .25 which is the direct translation of 25%? Which would greatly change the answer to the formula. Is it because you divide the 25% by the total capacity of the tank? That works for 100 gallons, but not 50 gallons, or 200 gallons.
Just trying to wrap my head around this. I feel as some information is missing. Thanks!