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A parabolic vertical curve is being designed to join a road of grade $+5 \%$ with a road of grade $-3 \%$. The length of the vertical curve is $400 \: m$ measured along the horizontal. The vertical point of curvature (VPC) is located on the road of grade $+ 5\%$. The difference in height between VPC and vertical point of intersection (VPI) (in $m$, round off to the nearest integer) is _________
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