Question

In 1992, only 275 people owned cellphones in Metropolis. Each year, cell phone use has continuously grown by 82%. How many cellphone users were there in 2000?

Answer 1

For this case we have the following equation of the potential type:
 y = A (b) ^ t
 Where,
 y: number of people with cell phones
 A: initial number of people with cell phones
 b: growth rate
 t: time
 Substituting values:
 y = 275 * (1.82) ^ t
 For the year 2000 we have t = 8.
 Substituting:
 y = 275 * (1.82) ^ 8
 y = 33105.77794
 nearest whole integer:
 y = 33105
 Answer:
 there were 33105 cellphone users in 2000