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1. The problem statement, all variables and given/known data

There are 150 rows at a concert hall. Each row you move back there is an increase of 10% in the number of seats. The first row has 100 seats. How many seats are there in the concert hall?

2. Relevant equations

I don't know the equation to represent this change.

3. The attempt at a solution

Obviously I could go through and do each rows amount of seats, but I'd like to know the equation that will solve this. Is it n(n+1)/2?

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# Homework Help: Increasing Row Size

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