1. Compare r/100 in the percent proportion and r in the simple interest formula. How are they the same? How are they different?
2.Explain how to find 57% of 42 using a scientific calculator.
3.Explain why an investor might invest a greater amount of money in a lower rate of interest instead of a higher rate.
4.Read the following excerpt from an article about the America's Cup yacht race in a magazine. Explain what is incorrect in this exerpt and why.
With a Ph.D. from MIT, (Dr. Koch) takes a scientific view of things, and quantifies the effort involved in winning the Cup as 55 percent boat speed, 20 percent tactics, 20 percent crew work, 5 percent luck, and less than 5 percent physical strength.
5.Draw a circle graph to represent the number of students in your school by grade level.
Write each ratio as a percent and then as a decimal.
6. 3/4
7. 2/25
Use a proportion to answer each question.
8. Eleven is what percent of 20?
9. What percent of 80 is 45?
10.Finance Kaylee Richardson invested $7200 for one year, part at 10% annual interest and the rest at 14% annual interest. Her total interest for the year was $960. Hwo much money did she invest at each rate?