) Sauce PCs 25 - 50% Norford et al., 1989 Impact and inkjet Printers 20- 25% Computer network equipment 30% Kunz, 1997 Computers 14 - 33% Komor, 1997 Monitors -28 - 85% Printers -9 - 32% PCs 5 - 35% Hosni, Jones, and X, 1999 Facsimile Machine 20 — 45% Network Server 50% Monitor 1