Capital budgeting Kaplan question doubt

Hi I have a doubt

Replacement project
Pp of new machine 8000
Shipping 2000
Sp of old machine 6000
BV of old 2000
Inventory increase cos of new machine 3000
AP increase cos of new Mac machine 1000

Tax 25%

What is the initial outlay ???

And : 7000 as per book

My doubt For calculating NWC : increase in CA so deduct 3000

Increase in CL so add 1000

NWC: -2000

So initial outlay will come 3000 instead of 7000

Can u pls clarify me as per book it’s 3000-1000 =2000