4: Farah plans to build a concrete walkway for her home during her vacation. The following schedule shows how project time will be allocated: Activity hours Purchase materials 5 Obtain rental equipment 2 Remove sod & level site 20 Build forms for concrete 10 Mix & pour concrete into forms 5 Level concrete 6 Let dry 24 Remove form from concrete 2 Return rental tools 1 Clean up 4 a. identify the value-added activities. How much is value added time? b. Identify the non-value added activities. How much total time is spent performing non-value added activities? c. Calculate the manufacturing cycle efficiency