Hi Serene, Disclaimer: There could be easier ways of doing this.
Lets say you are collecting funds for your pet project. Your goal is to raise 40 dollars.
1) So put 40 dollars in a cell, say, A2.
2) Put all your dollars given by each contributor in a column, say, A2:A16
3) Lets say you want to show the corresponding % for each contributor in col B2:B16
4) Go to B2 and write this formula =(100*A2)/A$2 and hit enter
5) Drag it down till B16.
bingo you have your dollars values in A3:A16 and your percentages in B2:B16. There are simpler ways of doing it, like using % in the formula, but, I think this is most easy per my opinion...