When the demand function is $q=60-2p,$ what is the price elasticity of demand when the price equals:

$($answer the question with a single decimal: for example, $-1$ becomes $-1\mathrm{.}0,$ while $-1\mathrm{.}5$ stays as $-1\mathrm{.}5$

$10$:

$15$ :

$20$ :

$25$ :