6-1: Converting percents to decimals and decimals to percents
6-2: Converting percents to fractions and fractions to percents
Section II Using the Percentage Formula to Solve Business Problems
6-3: Solving for the portion
6-4: Solving for the rate
6-5: Solving for the base
Section III Solving Other Business Problems Involving Percents
6-6: Determining rate of increase or decrease
6-7: Determining amounts in increase or decrease situations
6-8: Understanding and solving problems involving percentage points
3.
Understanding Equations The process of finding the numerical value of the unknown in an equation. Solve an Equation The knowns (constants) and unknowns (variables) of an equation. In the equation X + 7 = 10, the terms are X, 7, and 10. Terms The parts of an equation that are given. In equations, the knowns are constants (numbers), which are quantities having a fixed value. In the equation X + 7 = 10, 7 and 10 are the knowns or constants. Constants (Knowns) A mathematical operation or a quantity stated in symbolic form, not containing an equal sign. X + 7 is an expression. Expression A mathematical statement expressing a relationship of equality; usually written as a series of symbols that are separated into left and right sides and joined by an equal sign. X + 7 = 10 is an equation. Equation A mathematical representation of a fact, rule, principle, or other logical relation in which letters represent number quantities. Formula
Allied Plumbing sold 2,390 feet of 5/8-inch galvanized pipe in July. If 2,558 feet were sold in August, what is the percent increase in pipe footage sales?
The supermarket price of yellow onions dropped from $.59 per pound to $.45 per pound. What is the percent decrease in the price of onions?
27.
Determining the New Amount After a Percent Change
(p.173)
28.
Determining the New Amount After a Percent Change Example
Economists predict that next year housing prices will drop by 4%. This year’s price for an average house is $110,000. What will the average price of a house be next year?
29.
Determining the Original Amount Before a Percent Change
(p.188)
30.
Determining the Original Amount Before a Percent Change Example
Metro Motors sold 112 cars this month. If this is 40% better than last month, how many cars were sold last month?
31.
Determining the Original Amount Before a Percent Change Example (cont’d)
The second shift of a factory produced 17,010 units. If this amount was 5 ½% less than the first shift, how many units were produced on the first shift?
After a vigorous promotion campaign, HiLo Mart increased its market share from 5.4% to 8.1%, a rise of 2.7 percentage points. What percent increase in sales does this represent?
The unemployment rate in Glen Haven dropped from 8.8% to 6.8% in the past year, a decrease of 2 percentage points. What percent decrease does this represent?
A pre-election survey shows that the popularity of a presidential candidate has increased from 26.5 percent to 31.3 percent of the electorate, an increase of 4.8 percentage points. What percent increase does this represent?
Be the first to comment