Question

What will my peercentage saving be if I buy something in a sale that offers 3 for the price of 2?

Answer 1

Take the case where each item sells for $3 at regular price.

If you get 3 for the price of 2, then you pay 2*$3 to get 3 items, so each item costs $2.
Pecentage saving
= (discount)/original price
= ($3-$2)/$3
= 1/3
= 33.3%