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.
The overall change in points after three rounds is 5.3 points
Answer:
Step-by-step explanation:
For this problem, we will need to use the product rule:


In this problem,
and 
Finding the derivative of each gives us the following:


Plugging these values into the product rule gives us the final derivative:
