this is my homework tonight so I hope to have this answered quickly please. also an explanation would be nice so I could understand

This question awards 100 ! i really don’t want to fail i will also mark you !

Jabari is power washing houses for a summer job. for every job, he charges an initial fee plus $30 for each hour of work. his total fee for a 4 -hour job, for instance, is $170 . jabari's total fee,f, for a single job is a function of the number,t, of hours it takes him to complete the job. write the function's formula.

Your food costs are $5,500. your total food sales are $11,000. what percent of your food sales do the food costs represent?