Please! How to calculate a custom price based on user input?

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I’m so excited about Wix Code!
I am depressed about making a custom price based on user input, because I am new into coding. here is the link, https://www.victoriafurnicenter.com/KingKoil/CHIRO-ENDORSED

  • I want the website to calculate each price with 2 elements of dropdown, for visitor’s convenient. When 2 elements of dropdown has chosen, i want the price automatically calculated live.

  1. by size, has 5 types of sizes: 100x200, 120x200, 160x200, 180x200 and 200x200 c

  2. by needs, has 3 types of needs: mattress only, matrress with divan, or full set (mattress, divan and headboard)
    so visitors can understand,on chiro endorsed product page, they must choose one of 5 sizes (100x200, 120x200, 160x200, 180x200 or 200x200 cm), then they have to choose their needs (mattress only, matrress with divan, or full set), after pressing the submit button, they can understand the price appear after calculated based on which they have chosen.

  • Also I use database collection to show this product. can it work with database collection? any recommendation or solution?
    Thank You Wix Code Admin, I really wish Wix Code the best.