$169, you do 10% and times it 3 times to get 30 then add 9
The correct answer is $44.20.
If we add up all the tips, the total is $442. If we divide this by the number of days (10), then we find the mean.
442 / 10 = 44.2
Group the xs and the ys, 17+5= 22x 3+1=4y so y=4 and x=22.