Worked Examples for 3.3 Di Lesson

Example 1: Calculate mentally. a) 50 % of 80

Example 1: Calculate mentally. b) 2.5 % of 120

Example 1: Calculate mentally. c) % of 99

Example 1: Calculate mentally. d) 75 % of 24

Example 1: Calculate mentally. e) % of 99

Example 2: In a recent test, 75 % of people surveyed said they preferred grape juice to apple juice. If 240 people were surveyed, how many picked grape juice?

Example 3: It is customary to leave a 10 % to 15 % tip at most restaurants, depending on the quality of service. What amount should the tip be for a $54 bill?

Example 4: Estimate using Percent a) 47 % of 803

Example 4: Estimate using Percent b) 32 % of 293