Percent error (theoretical/actual value)?

sort of lost here... I know it's theoretical value - actual / theoretical x 100% but still lost. Any help appreciated

Acceleration measured (m/s2): .025
Acceleration calculated (m/s2): 10

total mass was .400 (kg)
Update: figures... i'm completely lost here

heres what my table looks like

mass of wagen: .399
mass of hanging line: .001
acceleration measured .025
Applied Fnet (kg): ?
Total Mass: .400
Acceleration calculated: 10
% error: ?
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