Mathematics: 2. In 1990, there were 1,200 cell phone subscribers in a small-town of Stephenville. The number of subscribers increased by 75% per year after 1990. How many cell phone subscribers were in Stephenville in 1999?

8/25Step-by-step explanation:...

2. In 1990, there were 1,200 cell phone subscribers

emily0259

23.06.2021

184,724.153

Step-by-step explanation:

Given

In 1990, there were 1200 cell phone subscriber in small town of stephenville

It is increasing by 75% per year after 1990

In year 1991 it is

$\Rightarrow 1200+1200\times 0.75\\\Rightarrow 122(1.75)$

In year 1992 it is

$\Rightarrow 1200(1.75)+1200(1.75)\times 0.75\\\Rightarrow 1200(1.75)(1+0.75)\\\Rightarrow 1200(1.75)^2$

So, it is increasing as 1200(1.75)^x

where no of years spent

After 9 years, it is

$\Rightarrow 1200(1.75)^9=184,724.153$

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