Answer:
2/25
Step-by-step explanation:
It will be 20/400 + 12/400
=2/25
96+264 = 360
360 \ 24 = 15
Therefore he received 15 boxes
A=P×(0.8)
A is the price after the markdown
P is the original price
0.8 is the multiplier because 1-(80/100)=0.8
80/100 is the same as 80%, which is the remaining value when 20% of the value of the item is deducted.