Answer:
a) new price = 78.40
b) markup = 22.40
Step-by-step explanation:
new price = original price +original price * markup percent
new price = 56+ 56 *.40
new price = 56+ 22.4
new price = 78.4
the additional cost is the mark up
markup = original price * markup percent
markup = 56 *.40
markup = 22.40