Answer :
So what you need to do is take your Initial value of 3.95
y=3.95(1+.2) You start with 1 book of 3.95 and if yo mark it up 20% thats .2 out of 1 so you add 1+.2 to get 1.2 and times 3.95 times 1.2 to get 4.74
Y=4.74
So the markup cost is 4.74
y=3.95(1+.2) You start with 1 book of 3.95 and if yo mark it up 20% thats .2 out of 1 so you add 1+.2 to get 1.2 and times 3.95 times 1.2 to get 4.74
Y=4.74
So the markup cost is 4.74