Manufacturing a product requires processing on four machines A, B, C, and D in the order A–B–C–(d) The capacities of four machines are A = 100, B = 110, C = 120 and D = 130 units per shift. If the expected output is 90% of the system capacity, then what is the expected output?
(a) 90 units (b) 99 units
(c) 108 units (d) 117 units