Fyi; for those of you who "do not find this set up of the site fair" are ridiculous an unappreciative. this site and the cooperative people on it have given you more than anyone else could have so who ever is going to start a riot, i hope you will be banned as soon as you do.
p. s.
to the creators for such a , sometimes irritating website lol

"jake’s roof repair has provided the following data concerning its costs: fixed cost per month cost per repair-hour wages and salaries $ 20,900 $ 15.00 parts and supplies $ 7.70 equipment depreciation $ 2,800 $ 0.35 truck operating expenses $ 5,720 $ 1.60 rent $ 4,690 administrative expenses $ 3,850 $ 0.50 for example, wages and salaries should be $20,900 plus $15.00 per repair-hour. the company expected to work 2,600 repair-hours in may, but actually worked 2,500 repair-hours. the company expects its sales to be $47.00 per repair-hour. required: compute the company’s activity variances for may."