Simplify:
2 11/12 + 5 1/2 + 3 3/8
Write you answer as a mixed number.

(write them out and convert them all into mixed fractions)

(find the LCD aka least common denominator)

(add all numerators together)

 (this is improper, so you need to convert back to mixed by dividing)

(this is your 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!