10.1 Percent 593 39. Determine the number of comedy movies streamed. 471 comedy movies 40. Determine the number of romance movies streamed. 244 romance movies 41. Determine the number of horror movies streamed. 192 horror movies 42. Determine the number of foreign movies streamed. 139 foreign movies Seawater Composition In Exercises 43– 46, use the table to answer the questions. The elements that compose seawater, along with the corresponding percents, are shown in the following table. Where appropriate, round your answers to the nearest hundredth. Seawater Elements Element Percent Oxygen 85.84% Hydrogen 10.82% Chlorine* 1.94% Sodium* 1.08% Magnesium* 0.13% Other elements* 0.19% * These elements are present in seawater as ions of the given element. 43. If a sample of seawater contains 25 m , how many m of oxygen are in the sample? 21.46 m of oxygen 44. If a saltwater aquarium contains 55 gallons of seawater, how many gallons of hydrogen are in the aquarium? 5.95 gal of hydrogen 45. Professor Buller collects a 500-m sample of seawater for her chemistry class. How many m of chlorine are in the sample? 9.7 m of chlorine 46. Kimball collects a 6000-m sample of seawater for his marine biology class. How many m of magnesium are in the sample? 7.8 m of magnesium Music Preferences In Exercises 47–50, use the circle graph to answer the questions. Students at Bayshore High School were polled to determine the type of music they preferred. There were 1960 students who completed the poll. Their responses are represented in the following circle graph. Round your answers to the nearest tenth of a percent. Music Preferences Rap, 921 Alternative, 470 Rock and roll, 274 Country, 176 Other, 92 Jazz, 27 47. What percent of students preferred rap music? 47.0% 48. What percent of students preferred alternative music? 24.0% 49. What percent of students preferred rock and roll music? 14.0% 50. What percent of students preferred country music? 9.0% In Exercises 51–70, where appropriate, round your answer to the nearest tenth of percent. 51. Flour Cost During the first year of business for Sutter’s Bakery, 50 pounds of organic flour cost $74.99. During the second year, the same amount of flour cost $81.49. Determine the percent increase in the price of flour. 8.7% 52. Bowling Cost At Rip Van Winkle Lanes, the cost for one game of weekday afternoon bowling was $2.49. Under new ownership, this same cost increased to $3.99. Determine the percent increase in the cost of one game of weekday afternoon bowling. 60.2% 53. Dog Weight Tango, a golden retriever, weighed 98 pounds. Five months after starting a new diet and exercise regimen, Tango weighed 79 pounds. Determine the percent decrease in Tango’s weight. 19.4% 54. Rainfall During July of 2022, the city of Sarasota received 5.8 inches of rainfall. During July of 2023, Sarasota received 1.1 inches of rainfall. Determine the percent decrease in rainfall for Sarasota from July 2022 to July 2023. 81.0% 55. Tax and Tip According to the Original Tipping Page, Tipping.org, it is appropriate to tip waiters and waitresses 15–20% of the pre-tax restaurant bill. The Leesebergs’ dinner costs $63.50 before tax, and the tax rate is 6%. a) What is the tax on the Leesebergs’ dinner? $3.81 b) If the Leesebergs decide to tip 15% of the pre-tax bill, how much is the tip? $9.53 c) What is the total cost of the dinner including the tax and tip? $76.84 56. Tax and Tip The Brants’ dinner (see Exercise 55) cost $68.00 before tax, and the tax rate was 7.5%. a) What is the tax on the Brants’ dinner? $5.10 b) If the Brants decide to tip 20% of the pre-tax bill, how much is the tip? $13.60 c) What is the total cost of the dinner, including the tax and the tip? $86.70 57. Pretax Amount The cost of a jacket at Macy’s is $54.27, including 8% sales tax. What is the pretax cost of the jacket? $50.25 58. Pretax Amount The cost of a book at Barnes & Noble is $32.10, including 7% sales tax. What is the pretax cost of the book? $30 59. Percentage of A’s In a mathematics class, eighteen students received an A on the third test, which is 150% of the students who received an A on the second test. How many students received an A on the second test? 12 students
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