Centi = Hundreds.
1.5533.
Round up by seeing if the number to the right of the hundreds place is 5 or higher. If it's not, don't change anything.
1.55 is your answer.
This would be a 20% increase.
Work is provided in the image attached.
The total value is seven hundredths. lmk if the is isn’t the answer you were looking for.
5 cent, how I got my answer.
I simply divided $18÷36=0.5
I hope this helps!