Fun-Kyung works as a tutor and earns $60. per hour. She has $792. in savings. She is planning an anniversary party for her parents. She would like to invite 40 guests. The party will cost her $1,520. for food and drinks nd $150. for the photographer. She will also have a favor for each of the guests, and each favor will cost$7.00. How many hours must she tutor to have enough money for the party?