Answer
$\Delta P=51.75\times10^9Pa$
Work Step by Step
Since we know that
$(k)=\Delta P/(\Delta V/V)$
It follows:
$\Delta P=k\times(\Delta V/V)$
$\Delta P=69\times10^9\times0.75$
$\Delta P=51.75\times10^9Pa$
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