Question

What percent does the population of weeds decrease each day?

Answer 1

$\begin{gathered} \lvert\frac{1650(0.85)^1-1650(0.85)^0}{1650(0.85)^0}\rvert\cdot100 \\ =\lvert\frac{0.85-0.85^0}{0.85^0}\rvert\cdot100=\lvert\frac{0.85-1}{1}\rvert\cdot100=0.15\cdot100 \\ =15 \end{gathered}$

Answer = 15%