Another way to think about it: for every 100 units in 10, you take 74. That adds up to 7.4.
On a 74% off sale, an item originally priced at $10 would be discounted by $7.4, bringing the price to $2.6.
Whether you are calculating a discount, a tax, a tip, or a commission, the math is always the same: multiply 10 by 0.74.