the owner of a parking garage located in a cbd has observed

Solution

Total space hours = 200*12 = 2400 space-hr

Commuters now being served = 0.6*200*9 = 1080 space-hr

Shoppers now being served = 0.4*200*3 = 240 space-hr

Total number of vehicles turned away = 200/0.7 - 200 = 85.71 = 86

Commuters not being served = 0.15*86*9 = 116 space -hr

Shoppers not being served = 0.85*86*3 = 219.3 = 220 space-hr

Total space hours of demand = 1080+240+116+220 = 1656 space-hr

Total space hours served = 1080+240 = 1320 space-hr

Number of space-hours required = 1656-1320 = 336 space-hr

PAcking efficiency = 0.9

0.9*12*N=336

=> N = 31.11

=> N = 32 additional spaces are required