Another way to think about it: for every 100 units in 10, you take 57. That adds up to 5.7.
On a 57% off sale, an item originally priced at $10 would be discounted by $5.7, bringing the price to $4.3.
Whether you are calculating a discount, a tax, a tip, or a commission, the math is always the same: multiply 10 by 0.57.