The operating cash flows calculated using the four different approaches are:
- \( OCF_{\text{EBIT}} = 100690 \)
- \( OCF_{\text{top-down}} = 94710 \)
- \( OCF_{\text{tax shield}} = 80670 \)
- \( OCF_{\text{bottom-up}} = 100690 \)
Thus, the final answers are:
\[
\boxed{OCF_{\text{EBIT}} = 100690}
\]
\[
\boxed{OCF_{\text{top-down}} = 94710}
\]
\[
\boxed{OCF_{\text{tax shield}} = 80670}
\]
\[
\boxed{OCF_{\text{bottom-up}} = 100690}
\]