40500
3 of them.
It is 40500 (of whatever) per hour.
3 significant figures.
there are 3 sig figs. 4, 0, and 5 are the sig figs
± 201.246118
40500
-1
30300
40500 mg
30,300 It is 10,200 more than 20,100 and 10,200 less than 40,500.
40500/75 = 540