Wall outlets - area around electrical outlets, telephone jacks, and the like. Duct system - air ducts of the heating and cooling system. Exterior windows - leakage around poorly sealed windows. Infiltration is detrimental to the utility bill as the untreated air leaking into the home causes the air conditioner to work harder in the summer and the heater to work harder in the winter. Answer these questions about the above graph.
Mathematical problems involving percentages usually fall into one of three categories.
Each will be described in turn. All problems involving the finding of percentages, or the actual amount represented by a percentage, are either multiplication or division problems. All percentages are parts of 100 that can also be expressed as a fraction with denominator 100. All percents are parts of 100 that can also be written as decimals to the hundredths place. Complete the following percentage problems involving multiplication.