If we assume that one delivery costs of 30 Euro, the interest rate is 10%, Price of the delivered goods is 28, Penalty of the deficit is 20%. We have 50 consumers, everybody coming to make shoppping in 80 days average and buys 3 units of the product on average then:
Based on the data provided here: the supplier delivers 70 goods in one delivery and the Interval of the delivery is 30 day we received that the annual cost is 423 Euro. The average annual costs incurred at tick 7442 day.
After this my goal was to improve our storage model so I increased the Delivery Lot from 70 to 85. So now after I got the result, the annual cost is 441 Euro which is slightly worse than the previous one.
Then I changed the Delivery Lot and the Interval of Delivery. Delivery Lot changed from 85 to 120 and the Interval of delivery changed from 30 to 45. Now the annual cost is 379 Euro, and we can say that it has improved. The average annual costs incurred at tick 8437.
I have made changes again in Delivery Lot and the Interval of Delivery. Now Delivery Lot changed from 120 to 150 and the Interval of delivery changed from 45 to 60. The result after the changes is 302 Euro. So, the annual cost changed from 379 to 302 and for this reason, we have again obtained a more favourable annual cost. This result incurred at tick 14661.