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If one publication has 15,000 subscribers and a growth rate of 15% (per year) and another publication has 20,000 subscribers and a growth rate of 4%, how long will it take the two to intersect? And how long do you calculate this?

Radost
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Matt
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    Hi Matt, welcome to StackExchange! Can you tell us what you've tried so far/what you've leaned in class about these types of problems? – scoopfaze Jun 24 '19 at 22:58

1 Answers1

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The growth rates would not intersect.

The numbers of subscribers would coincide.

Is 4% growth rate per year as 15% is?

Would you coumpound the growth rate?

On the second year would the amount be multiplied by $1.15^2 - 0.15$ of the original amount or simply increased by 15%?

Solve one of these accordingly

$15000*1.15^x = 20000*1.04^x$

$15000*(1 + 0.15x) = 20000(1 + 0.04x)$

George Ntoulos
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