How do you treat inventory & AR related to multiple & PP?

HI, Looking for some feedback on my thinking and also open to ideas on structure plz
I am considering a business in wholesale distribution

Rev: $1.4. /EBITDA: $300k /Cash, AR & Inventory: $500k /AP: $15k No debt
Equipment & racking etc :$100k

The seller is asking $1.5m all in.

What is the multiple?
$1.5m-$500k= $1m / $300k = 3.3x
or
$1.5m/$300k= 5x?

How is inventory usually treated related to the purchase price? How does WC usually work in a scenario like this?
Thank you