Computing, Analyzing and Interpreting Residual Operating Income $($ROPI$)$

In its annual report for the fiscal year ended July $27,2019,$ Cisco Systems reports the following $($$ million$)$:

Assuming the following weighted average cost of capital $($WACC$),$ what is Cisco's residual operating income $($ROPI$)$ for the fiscal year ended July $27,2019?$

b$.$ At what level of WACC would Cisco not report positive residual operating income for the year?