Answer
The downward force on the parachute from the person is $~~580~N$
Work Step by Step
The downward force on the parachute from the person is equal in magnitude to the upward force on the person from the parachute:
We can find $F$, the upward force of the parachute on the person:
$mg-F = ma$
$F = m~(g-a)$
$F = (80~kg)~(9.8~m/s^2-2.5~m/s^2)$
$F = 580~N$
The downward force on the parachute from the person is $~~580~N$
