$72 is %25 of what

72*4=288. This is multiplied by 4 because 1/4 = 25% of. Hope this helps 

25% of 72$

25% = 1/4

72/4

(72/2=36)                   (36/2=18)

$${\frac{{\mathtt{72}}}{{\mathtt{4}}}} = {\mathtt{18}}$$

18$