Answer:
$84
Step-by-step explanation:
720x30=21600
21600/100=216
216=markdown (as a number instead of a percentage)
Now subtract that like this
720-216=504
504= sale price
Then do this
504-420=84
Therefore it is $84
Hope you understand!
C. 60 unit cubes.
Each level has 20 unit cubes, times 3 is 60 in total.
(15^3)^3
the rest are equal to 15^6:)