How to solve for which model is correct?

The cash price of a television is $580.the hire-purchase price of the television is $865.the hire-purchase price is an initial deposit of n% of the cash price and 6 equal monthly payments of $120.find the value of n.

The sales totals at macy's food store have increased exponentially over the months. which of these best shows the sales in the first three months?

Me with this one question, and i'll upvote the brainliest answer