Bulk Pricing

I need to create a product at which the price changes according to the number of units purchased. Ex.
If you buy 12. the price per unit is $ 9.50 = $ 114
If you buy 24. the price per unit is $ 9.00 = $ 216
If you buy 50. the price per unit is $ 8.50 = $ 425. Etc.

How can I make the store show me the price per unit but in the cart show the final or total price?

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