•Convert 20% to decimal.
To convert a number to a decimal, divide by 100
20 divided by 100= 0.2
•$171.70 x 0.2=34.34
•171.70 + 34.34=206.04
The amount of the markup is $34.34
I hope I did this right and it helps, calculating markup becomes easier to do when you get more familiar with it.