How can I create buy one get one and buy two get three offers in my store?

Shopify Discussion
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1

I want to make an offer in my store…
Buy One Get One
such as:
Product 1 Price: 30, Product 2 Price: 50
Order: 50 (Highest Price)
Buy Two Get Three
such as:
Product 1 Price: 30, Product 2 Price: 50, Product 3 Price: 40, Product 4 Price: 60, Product 5 Price: 60
Order: 120 (Highest Price)