Try to remember that a "per-centage" of something is simply one hundredth of it. So, if you need to find a 'per-centage' of something, just divide it by one hundred. Therefore, as your question looks for 10% of 32, just divide 32 by 100, and then multiply the answer by 10. The answer is 3.2. If you take this discount from the original amount, you get the amount you have to pay (32.00 minus 3.2 equals 28.8)
10% of any number is the first digit (not counting cents) if it is one digit. For example, 10% of $3.00 is .03 cents. 10% of $10.00 is $1.00. If it is two digits (not including cents), it is the first number with a decimal point. 10% of $50. is $5.00. %10 of $75 is $7.50. 10% of $95 is $9.50. For a number with three digits (not counting cents), %10 is the first two numbers and a decimal point. 10% of $500.00 is $50. Just move the decimal point to the left one number or until the number makes sense to you and you'll have %10. In other words, the number stays the same, the decimal point changes.