Question

The floor of a dance studio is covered with 615 tiles. The owner of the studio replaced the tiles last year. The tiles cost $15 for a set of 8 and $2 for each additional tile.
What is the monthly increase the owner charged each of her 34 students over a 6-month period to cover the cost of replacing the tiles?
oops, I made a mistake. There are 435 tiles!!!!

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