So at 30 we got one surface. At 40 we got another with still one able to be on the sales floor. 45 both could be on floor. 50 we got yet another table, with still only 2 on floor..... 55 no change. At least no change I am yet able to figure out. Why is this?

That page is actually what prompted my question. Looking at the pattern circle 55 should be 3 on sales floor, 3 total

yes 45 + 15 is 60, wonderful math. So following the pattern at 60 we should get another surface total..... which is there in the ability list. But at 55 the 3rd surface stuck in the backroom should be able to be pushed