Another way to think about it: for every 100 units in 10, you take 43. That adds up to 4.3.
On a 43% off sale, an item originally priced at $10 would be discounted by $4.3, bringing the price to $5.7.
Whether you are calculating a discount, a tax, a tip, or a commission, the math is always the same: multiply 10 by 0.43.