Five aisles of storage are provided with an S/R machine dedicated to each aisle. Randomized storage is used. The S/R machine travels simultaneously horizontally and vertically at speeds of 400 fpm and 80 fpm, respectively. Each aisle is 300 long and 50

high. The time required to pick up or put down a load is 0.30 minute. Over an eighthour period, a total of 400 single-command cycles and 400 dual-command cycles are performed. Determine the system utilization.