# SOLUTION: Before conference swim championships, Suzanne’s best time in the 200 yard butterfly race was 2 minutes, 23 seconds. In the conference championships, she won 10th place by swimming

Algebra ->  Algebra  -> Percentage-and-ratio-word-problems -> SOLUTION: Before conference swim championships, Suzanne’s best time in the 200 yard butterfly race was 2 minutes, 23 seconds. In the conference championships, she won 10th place by swimming      Log On

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 Question 250952: Before conference swim championships, Suzanne’s best time in the 200 yard butterfly race was 2 minutes, 23 seconds. In the conference championships, she won 10th place by swimming the 200 yard butterfly in 2 minutes, 15 seconds. What per cent decrease is that? A.3.6% B.5.6% C.5.9% D.6.2% E.36.9% Answer by Theo(3458)   (Show Source): You can put this solution on YOUR website!2 minutes 23 seconds is equivalent to 143 seconds. 2 minutes 15 seconds is equivalent to 135 seconds. she lowered her time by 8 seconds (135 + 8 = 143). the percent decrease equals the difference divided by the first time, with the result of that operation being multiplied by 100%. This becomes: 8/143 = .05594405594 * 100% = 5.594405594 percent. that's pretty close to selection B of 5.6%