Help me understand how Tstar =15

1. The relevant parameters are Item 1 s1=1/6 hours K1=$280 per set-up 1=80 items per hr P1=800/3 items per hr h1=$0.10 per item per hr c1=$1.00 per item Item 2 s2=1/6 hours K2=$800 per set-up 2=60 items per hr P2=180 items per hr h2=$0.10 per item per hr c2=$2.00 per item The feasibility constraints are - Capacity constraint: P11+P22=103+31=3019?1 - Minimum period length constraint: Tmin1s=119/301/6+1/6=1110hours Plugging into the formula T= length of each cycle =TELSP=N1=15 hours. Equivalently, N=NELSP=151 cycles per hour. Other quantities of interest include