In 2010 the number of subscribers to premium cable TV in the

In 2010, the number of subscribers to premium cable TV in the United States was about 88.4 million, an increase of 8.1% over the number in 2005. How many premium cable subscribers, to the nearest tenth of a million, were there in 2005? The answer should be 81.8 million according to my answer sheet.

Solution

Let the no. of subscribers in 2005 be x

8.1 % growth in 5year

So, after 5 yrs subsribers becom --88.4 million

x( 1+0.081) = 88.4

x = 81.77 = 81.8 million users in 2005