whats my gross profit in used car inventory without inventory count?

We didn't keep track of how many cars we sold and its cost.

 

I have totals from bank account as Deposits, Payments and Checks paid. Deposits is money from selling cars, Payments and Checks Paid are for buying cars. 

 

Deposit: $600K

Payments: ($400K)

Checks paid: ($100K)

Does this mean, I have gross profit of $100K or loss of $166K (see below)

 

We also received 1099-K from credit card company for $75K. (we do have cash sales too)

 

Can I assume this is for Part 3 on Sch C

 

Beginning Inventory: $36K (from last year Line 41 part 3  Sch C)

Purchases: $500K

Cost of good sold: -$241K

Ending Inventory: $195K (this is guess value)

 

So, $75K from  1099-K  minus -$241K COGS is -$166K? is this correct?

 

I thought gross profit is sales minus cost. but here it seem it depends on my ending inventory? remember I haven't posted my expenses to run the business like rent, taxes etc