A particular parking garage is increasing its rates by 10 percent per month. Bob decides to reduce the number of days he uses the garage per month so that the amount he spends at the garage per month remains unchanged. Which of the following is closest to Bob’s percentage reduction in the number of days he uses the garage each month?	Choose the correct answer
A) 8%	B) 9%	C) 10%	D) 11%	E) 12%
Let x be the original number of days that Bob used the garage.   Let P be the original cost per day.   Let N*x be the new number of days that Bob uses the garage.   N*x*1.1P = x*P   N*x = x/1.1 which is about 0.91x, thus a 9% reduction.   The answer is 9%.
<result>B</result>
A particular parking garage is increasing its rates by 10 percent per month. Bob decides to reduce the number of days he uses the garage per month so that the amount he spends at the garage per month remains unchanged. Which of the following is closest to Bob’s percentage reduction in the number of days he uses the garage each month?