Keep in mind that you might need to create a special Score Field for this particular case.
For example: "Form Score"
Going back to Rachel's example when you set up the flow in your campaign you will need to choose that "Form Score" from the drop down menu.
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you can do this with a velocity script in the email. Check out developers.marketo.com for a description of how to use velocity and check in this community for examples. I am sure you will find a suitable example to copy.
As Rachel and Jamie suggested, you can use
1> Marketo flow actions
Only if your 'grand total' is a 'score' type field in Marketo. And the others are lead tokens.
Then you can add one flow step each to add individual lead field token value to that score field.
Then you can merge the grand total field token in the email.
2> Velocity scripting
If you already have this 'grand total' field created in Marketo and it is not a score field, you then will be better off using velocity script to 'on the fly' calculate the 'grand total' for the email. Please note that the 'grand total' you calculate in such a way will not be stored in Marketo database for future use. It is only for 'display only' in that email.
On the Marketo landing page where you get these price points, add the 'grand total' field as a hidden field. And before you submit the form to Marketo, add up and populate the grand total value. Then simply use that value where ever you need to use including email.
4> Use Web hooks
But frankly, one of the above 3 options are better suited for this simple ask.
Hope this helps