The high school musical averaged $128.45 in ticket sales for the six days that it was open. if sales on the first five days were $131.75, $102.50, $119.00, $113.25, and $124.75, what were the gross ticket sales and what were the ticket sales on the sixth day?

me. i have a test on monday and i can't seem to fully understand how to solve gross pay.

Mr. pines is considering buying a house and renting it to students. the yearly operating costs are $1,900. the house can be sold for $175,000 at the end of 10 years and it is considered 18% to be a suitable annual effective interest rate. if the house costs $100,000 to purchase, how much would you need to charge your tenants each year in rent? (assume a single payment for the years rent at the end of each year)