Multiply a decimal by a decimal by using a label and a textbox

oksy so here is my objective... 1) so far (with the help of this site) i have got it to where it averages all the columns and doesnt include the 0's in the average ( i will add more columns later)...when the average is calculated it is written next to the word average as text (string) i want to make it where i can take that string, convert it into a decimal form and then multpily it by the decimal inside of the text box. now inside of the textbox it will say like 62.8 (62.8%) so it will have to divide the number inside the textbox by 100 before it can be multiplied by the average

Thanks in advance!

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