kill rate of insecticide differential equations A field of wheat teeming with grasshoppers is dusted with an insecticide having a kill rate of 200 per 100 per hour.What percentage of the grasshoppers are still alive 1 hour later? I did not understand the units.What does 200 per 100 per hour means?Hence I could not solve the problem.answer is 13.53%. Please tell how.

It means exponential decay, $P(t)=P(0)e^{-2t}$. Fairly standard terminology, though a little peculiar. The $200$ per $100$ is $200\%$.