2007 AMC 10A Problem 6

Problem 6 of 25EasierAlgebra

At Euclid High School, the number of students taking the AMC

10

was

60

2002,

66

2003,

70

2004,

76

2005,

78

2006,

and is

85

2007.

Between what two consecutive years was there the largest percentage increase?

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Solution

From

2002

2003,

the increase is

\dfrac{6}{60} = \dfrac{1}{10} = 10\%.

The other increases are

\dfrac{4}{66},

\dfrac{6}{70},

\dfrac{2}{76},

and

\dfrac{7}{78},

each less than

\dfrac{1}{10}.

So the largest percentage increase was between

2002

and

2003.

Thus, the correct answer is A.