Answer
Output will increase by 0.3% in the short-run and 52.5% in the long-run.
Work Step by Step
$\Delta qty\%=\Delta price\%\times E_s$
Short-run
$\Delta qty\%=15\times0.2=0.3\%$
Long-run
$\Delta qty\%=15\times3.5=52.5\%$
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