What is the Aggregate WLL of the securement system for a load secured with 7 tiedowns: 3 rated at WLL of 4,000 lbs, 2 at 6,500, and 1 at 8,000?

How do you calculate Aggregate Working Load Limit for tiedowns?
To calculate Aggregate Working Load limit, add together:
50% of the WLL of each end section of a tiedown that is attached to an anchor point.
50% of the WLL of each end section that is attached to the cargo