How to calculate a total sum of all previous totals using JS

[TheWizzing]

I'm trying to replicate the calculation method used in the pdf: Time Calculation_BB.pdf, and so far i've managed to transfer the code used to calculate the individual totals for each row. Now i would like to multiply all these individual totals into one field using JS, but i can't figure out how this should be done. 

I'm a bit of a novice regarding javascript, so i would really appreciate if someone could point me in the right direction. 🙂

[try67 · Accepted solution]

In the calculation scripts, change all instances of event.target.value = ... to event.value = ...  .