Lets break the problem into 2 parts.

1st part: Calculate profit of 5 days and 3 shifts
Given profit of 1 shift = 600
so for 3 shifts and 5 days: 600 * 3 * 5 = 9000

2nd part: Calculate profit of 2 days of weekend and 3 shifts
Given profit of 1 shift = 25% greater than usual days (600) = 125% * 600 or 1.25 (600)
so for 3 shifts and 2 days: 600 * 1.25 * 3 * 2 = 4500

Total Profit = 9000 + 4500 = 13500 option C

thank you! I was thinking on this about 10 minutes. I am happy that you solved it!

The trickiest part for me was the wording. Make sure you guys read the portion that says "for every hour of every day". This means that in one day a machine has 3 shifts, not just one shift. On a TR-F day, a machine will have three 8 hour shifts so that means it'll make 600 dollars every shift (600)(3 shifts)= $1800. In the span of the 5 days (Thursday-Friday) it has made a profit of 9000. On Saturdays and sundays, it makes on average, 25% greater profits than the standard Tf-F shifts. This means that in one shift it'll make 600*1.25= 750 profit. Since 1 day has 3 of these shifts it is 750*3 which equals 2250. Add both days together and you get 4500 on those particular days. add them all up to tally the total average profit and you get 13,500. Cheers!

great topic