I need help with verification of my formulas in my Excel spreadsheet calculating an increase and decrease of percentages?

I need help with verification of my formulas in my Excel spreadsheet calculating an increase and decrease of percentages?

Assignment Question:

What is percent? Write your height in inches. Suppose it increases by 15%, what would your new height be? Now suppose your increased height decreases by 15% what is your new height?

I need 50-100 word explanation on what is percent and on how I obtained my results.

The wording for this DQ can be misleading. You are asked to increase your current height by 15%. Then you are asked to take that new increased height and decrease it by 15%. You are not asked to decrease your original height by 15%. Also, make sure to define percent.

I really need to make sure the formulas I have are accurate. I do not think my decrease percentage formulas and results are correct.