Marsha Blant plans to build a concrete walkway for his home during his vacation. The following schedule shows how projecy time will be allocated: Hours Purchase Materials 5 Obtain rental equipment 3 Remove sod and level site 10 Build forms for concrete 12 Mix and pour concrete into forms 5 Level concrete and smooth 2 Let dry 22 Remove forms from concrete 1 Return rental tools 1 Clean up 2 a) Identify the value-added activities. How much of the total 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