Calculate price difference on product in FIFO order

[JackDanIce]

Hi,

I have a table in date order (oldest to newest, by day, including duplicate dates) with ledger entries for stock purchases and stock sold.

I will never sell more than what is available to sell

Date	Order	Product	Quantity	Unit Price	Unit Price Difference (£)	Unit Price Difference (%)
01/01/2019	Buy	A	50	£2
02/02/2019	Buy	A	100	£1
03/03/2019	Sell	A	-50	£10	?	?

If I need to calculate difference in price for A as £8 (£10 - £2) for date 03/01/2019, what formula would I need, based on first Buy price for Product A vs first Sell price for Product A
Related, if for 03/01/2019 -100 were sold, how would I calculate price difference as: £8.17 for Product A? £10 - (50*£2 + 10*£1)/60
And formula for % difference for same!

TIA,
Jack

 

[KOKOSEK]

Date	Order	Product	Quantity	Unit Price	Unit Price Difference (£)	Unit Price Difference (%)
01/01/2019	Buy	A	50	£2
02/02/2019	Buy	A	100	£1
03/03/2019	Sell	A	-50	£10		?

If I need to calculate difference in price for A as £8 (£10 - £2) for date 03/01/2019, what formula would I need, based on first Buy price for Product A vs first Sell price for Product A

=E4-SUMIFS(E:E,A:A,MINIFS(A:A,C:C,C4))

Related, if for 03/01/2019 -100 were sold, how would I calculate price difference as: £8.17 for Product A? £10 - (50*£2 + 10*£1)/60

I think, if sold 100 --> £8.5 =10-((50*2+50*1)/100)

 

[JackDanIce]

Thank you Kokosek,

=E4-SUMIFS(E:E,A:A,MINIFS(A:A,C:C,C4))

If more dates are added with similar data, will this formula only pull for the earliest MINIF date? I need it to work on a FIFO basis (first in, first out)

My error, meant if 60 were sold

 

[KOKOSEK]

How do you want to solve this manually it the case if there are few deliveries on the same date (MIN date) with different price?
What your 'First Buy price' will be? Maybe it is worth to create additional column with weighted average price for each delivery date?

 

[JackDanIce]

Happy to use a weighted average or other helper column, may need similar for quantity i.e. running total available in stock

Maximum 1 delivery per product per date. Different products can exist on matching dates.

'First Buy price' is first price for a product after it's quantity increases from 0 (assume all products quantities start at 0)

i.e.

Date	Order	Quantity	Price
01/01/2019	Buy	100	£1
02/02/2019	Sell	-100	£10
03/03/2019	Buy	100	£2

So in data above, 'first buy price' from 01/01/2019 - 02/02/2019 is £1

After 02/02/2019 next 'first buy price' is £2 until quantity falls back to 0

At the moment there is just a single ledger table that is meant to show change in cash and change in quantity and then margin calculations are needed from price changes over time (like table in #1)

 

[KOKOSEK]

Thank you Kokosek,

=E4-SUMIFS(E:E,A:A,MINIFS(A:A,C:C,C4))

If more dates are added with similar data, will this formula only pull for the earliest MINIF date? I need it to work on a FIFO basis (first in, first out)

If it is only 1 delivery per day First Buy date is MIN date.