Need help Rounding up a Calculated Field

Hello! I have absolutely NO experience with JavaScript, but everything I read says I need a script to make my calculated field Round Up. While I understand that, I have not a clue where to put this in, or how I would need to change it to perform the actions I need it to.

I have a form that adds 8 fields up for the Subtotal. One of these fields is multiplied by a number with 6 decimal places. So currently, even though it only shows 2 decimal places, I believe the subtotal is rounding down based on that calculation, and I need it to round up.

I've attached a screenshot of the calculation that is causing the question. If someone can easily provide step-by-step instructions on how to add a script to achieve the correct calculation to 2 decimal points, including where in Acrobat Pro DC to enter the script and how to write it, I would be so grateful!