If the price of chocolate$-$covered peanuts decreases from $$1\mathrm{.}10$ to $$0\mathrm{.}90$ and the quantity demanded increases from $180$ bags to $220$ bags, this indicates that, if other things are unchanged, the price elasticity of demand is:

OO

$-2$

$-1$

$-0\mathrm{.}5$