Question

In 1996, only 193 people owned cellphones in metropolis. Each year, cell phone use has continuously grown by 58%. How many cellphone users were there in 2008? (Show your work)

Answer 1

A = 193e^(0.58*12)
A = 203351 people

Answer 2

For this case we have an equation of the form:
 $y = A * (b) ^ x$
 Where,
 A: initial amount
 b: growth rate
 x: time in years
 Substituting values we have:
 $y = 193 * (1.58) ^ x$
 For the year 2008 we have:
 $x = 2008 - 1996 x = 12 y = 193 * (1.58) ^ {12} y = 46713.49403$
 Round to the whole whole integer:
 $y = 46714$
 Answer:
 there were 46714 cellphone users in 2008