Sara is working on making her house more eco-friendly. She has a number of upgrades she wants to make such as replacing her toilet that uses 5 gallons per flush with a new toilet that uses 1.2 gallons per flush. She also wants to replace a leaky faucet in her kitchen. Finally, she would like to replace her old washing machine which uses 35 gallons of water per load with a new high-efficiency model that only uses 10 gallons per load.

Which item should Sara replace first and why? Support your answer with evidence and reasoning. (4 points)