In January of 2016, there were 100 cats and 125 dogs in a town. In January of 2017, there were 115 cats and 150 dogs. By approximately what percent did the ratio of cats to dog decrease from the 2016 to 2017. Choose the correct choice from the following answers: A) 12.9% B) 11.0% C) 15% D) 18% E) 5%
2016: cats/dogs = 100/125 =660/750   2017: cats/dogs = 115/150 =575/750   ASIDE: It's useful to write both ratios with the same denominator. This allows us to IGNORE the denominator and focus solely on the numerators.   So, our ratio went from 660/750 to 575/750   Ignoring the denominators, we went from 660 to 575   The percent change = 100(difference in values)/(original value)   = (100)(660-575)/660   = (100)(85)/660)   ≈ 12.878...   12.9%nswer: 12.9%
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In January of 2016, there were 100 cats and 125 dogs in a town. In January of 2017, there were 115 cats and 150 dogs. By approximately what percent did the ratio of cats to dog decrease from the 2016 to 2017.