Multiply range of cells by set value

Hello-
I'm trying to multiply a range of cells by a specific value with the result populating in the next column. I need the code to only calculate the formula if there is a number in my range (I have blank cells & cells with text that I don't want messed up). Ex. If A1 has a value, then multiply by .66 and input result in B1.

I can have the value that each cell needs to be multiplied by in another cell or the value just in a formula. I have found many similar posts on this problem but can't seem to get the solutions to work 100% correctly for me. I'm very new to code/VBA/macros and am trying to self-teach myself- it's going great, clearly

Thank you in advance!!!!