382.2-297.3=84.9 How i rounded ... 382.24 (0-4 we round it on the same decimal for ex. 2 as we had in this problem.In the another one we have 297.28 (5-9 we round it on the bigger decimal for ex. 3 as we had in this problem.)Hope this helped.
It depends on how good the service was. it the service was really bad or just bad than maybe 2$, if the service was ok 5$ and finally if the service was extremely good and everything was just the way you like it then I would say tip 10$-20$