College Math

2.13 Chapter Two Review Answers 1. a Solution: On Saturday evening, the total cost is (100%+15%+7% = 122% of 22.79), that is 122 100 ∗ 22.79 = $27.81 On Sunday evening, the total cost becomes (100%+20%+5% = 125% of 20.67), that is 125 100 ∗ 20.67 = $25.84 Hence, on Saturday, higher amount is paid and the difference is ($27.81 less $25.84 = $1.97) 2. d Solution: At the end of 2012, the price of share is worth $150. During 2013, it increased by 12%. The share price at end of 2013 becomes (100+12)/100* 150 = 168. During 2014, it decreased by 10%. The share price at end of 2014 becomes (100-10)/100*168 = $151.2 3. b Solution: Let the selling price of one ball be x. The selling price of 11 balls = 11x and the selling price of 10 balls = 10x. Cost price of 11 balls = Selling price of 10 balls = 10x In this case, selling price of 11 balls > cost price of 11 balls, hence, it is the case of profits. Profit = selling price of 11 balls – cost price of 11 balls Profit = 11x – 10x = x Profit % = Profit/Cost price * 100  Profit % = x/10x * 100 = 10% 4. a

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