Student Edition - Mathematics in Context - Britannica

CMany ChangesTo calculate the sale price of an itemwith a discount given as a percent orfraction, you can do it with onemultiplication calculation.For example, suppose an itemis discounted by 25%.The discount is 25%, or 1 4.The new price is 75%, or, 3 4, of the old price, so multiply 3 4timesthe original price.Increasing a price by a percentis the same as taking 100%plus the percent increase ofthe price.0 10% 100%0 10% 100%0 1 1 1 2For example, increasing aprice by 50% is the sameas finding 150% of the price, 0%or multiplying 1 1 2 times the original price.100% 150%In other words, increasing by 50% is the same as multiplying theoriginal price by 1 1 2or 1.5.00% 75% 100%3 44 4Save Supermarket orders fresh fruit each day. Tim records changesin weight on a chart. The manager compared today’s weight toyesterday’s weight on a chart.Fruit OrderApplesPearsOrangesBananasChange in WeightOne-quarter moreOne-third lessTwo-fifths lessThree-tenths more1. Use bars to indicate the change in weight for each type of fruitSave Supermarket orders. Label the bars.24 More or Less