Milestone $1$:

David Kozlowski has been running a collector's shop called 'David's Retro Room' since $2020,$ trading

with a wide variety of memorabilia ranging from retro gaming, superheroes, anime, playing cards and

other categories of collector's items. His business approach is to allow collectors to display their

collectables in his shop until they are sold to another collector.

Since inception, he had been registering them manually, capturing details such as surname and name,

the name of the collectable, the category and sub$-$categories it belongs to$,$ number of pieces and

expected price etc. Each registered member can place their collectable in the shop for $6$ months.

They have to pay rent to David to keep their collectables in the shop. Rent is on a daily basis. If he

sells any item he gets a $25\%$ commission of the selling price. Rent rate is according to the Category

and sub$-$category of the collectable.

Rent chart is given below: