Leon works as an operator of an ice-resurfacing machine. The machine needed gas. The manufacturer designed the machine so that the water tank and the gas tank are right beside each other. In addition, the two tanks are similar in shape and colour. Leon made the mistake of filling the gasoline tank with water. While filling the gas tank with water, some gasoline fumes escaped and reached a nearby heater. This caused an explosion and Leon wound up suffering burns to over half of his body. Leon sued the manufacturer of the resurfacing machine for negligence.

Explain what Leon will have to demonstrate to prove his negligence claim.What arguments could the manufacturer make? You are the judge. Make a decision and explain how you reached your decision.