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#36190

applications

inequalities

medium

75 sec

A homeowner spends $4,500 to add insulation to their attic. Before the insulation, their average annual heating bill was $1,800. After the insulation, the average annual heating bill is $1,200. What is the minimum number of full years after the insulation is installed for the total amount of heating cost savings to exceed the installation cost?

• Up to 5 characters (6 if negative). Only numbers, decimal (.), fraction (/), negative (-).
• Fractions must be in lowest terms.
• Mixed numbers must be converted to improper fractions.