Book: Into the Shadows - Character Negotiation, Blast from the past Options

[Khadajico]

I was re-reading the book recently and I found a passage that is still confusing me, so I thought I would throw its interpretation open to the net.

Story: Would it help to say I'm Sorry (pg 194 in my copy)

The Johnson has offer 20k in corp script for a job, 10k upfront.

There is a bit of banter then the following section:

----
Iron Mike threw him a nod. "You'll see a report in the newsfax. Net Thirty, with six in ten"
The corporator's head cam up. "Ten in five and two for cash?"
"Major corporate script or Elven, yes. Otherwise no deal"
----

Now my confusion is, I can see Iron Mike is asking for 30k, but the rest makes no sense to me as no reference to the total amount for the run was discussed in the rest of the story.

For my sanity can anyone offer any reasonable interpretation ?

Khadajico