The number of people who own computers has increased by 23.2 percent annually since 1990. if half a million people owned a computer in 1990, predict how many people will own a coumpter in 2015

There would be at least 92 million people who will own a computer in 2015.

I don't know how to make a function out of a percentage, that is why I used excel to compute annual population.

YEAR     POPULATION   Increase of previous years population
1990          500,000 
1991          616,000         1.232
1992          758,912         1.232
1993          934,978         1.232
1994      1,151,894         1.232
1995      1,419,134         1.232
1996      1,748,373         1.232
1997      2,153,996         1.232
1998      2,653,723         1.232
1999      3,269,387         1.232
2000      4,027,885         1.232
2001      4,962,354         1.232
2002      6,113,620         1.232
2003      7,531,980         1.232
2004      9,279,400         1.232
2005    11,432,221         1.232
2006    14,084,496         1.232
2007    17,352,099         1.232
2008    21,377,786         1.232
2009    26,337,433         1.232
2010    32,447,718         1.232
2011    39,975,588         1.232
2012    49,249,925         1.232
2013    60,675,908         1.232
2014    74,752,718         1.232
2015    92,095,349        

The range would be 13 because you’re finding the difference