The processing of Q vaccination appointments can be done using the hours of computer time (denoted by K) and hours of human time (denoted L). The processing of Q=400 vaccination appointments requires 4 hours of computer time (L=0 and K=4) or 20 hours of human time (L=20 and K=0). Hours of computer time and hours of human time are perfect substitutes; for example, the processing of Q=400 vaccination appointments could also be done using K=2 hours of computer time and L= 10 hours of human time. Solve D.)

D.) Determine the total cost in terms of Q0, w, and r.