<span>Whole number means that we cant use coma, so </span>smallest six digit whole number is 100000 and the greatest four digit is 9999. Now we have to just subtract 100000 and 9999 to see the difference, so 100000-9999=90001 - its the result.
First we want to find how much it costs for 1 stamp, so we do 8.28 divided by 18, which equals 0.46. Then, we multiply 0.46 and 12, which is 5.52. Therefore, it would cost $5.52 to buy 12 stamps.
