DATA Manipulation - Excel

I need help with Excel. I am looking for someone out there to provide me with a formula that will do the following:

I have 5 columns:
Cost Price - Value in this cell
High Price - Value in this cell
Low Price - Value in this cell
Net Profit -Formula in this cell
Net Profit % - Formula in this cell

What I need is for a formula to change the 'Low Price' cells so that this equals a Net Profit Percentage of 6%.

I will give £5 to someone who can provide me with a workable formula that can also be manipulated should I want to change it to 7%, 8% and so on.