\(\text{Efficiency} = \frac{\text{Output Work}}{\text{Input Work}}\)

Given: \(\text{Efficiency} = 80\% = 0.8\), \(\text{Input Work} = 200 \text{ J}\)

Then, the output work is calculated as follows:

\(\text{Output Work} = 0.8 \times 200 = 160 \, \text{J}\)

Thus, the output work is: \(\text{Output Work} = 160 \, \text{J}\).