 Quandaries and Queries Dear Sir or Madam: If I buy something for \$10 and want to sell for 25% more, do I multiply by 1.25 or divide by .75? Or another way - why do I get \$13.33 when dividing by .75 ? Thank you for your time, Charlie Hi Charlie, There is part of your first question that is implicit, but if it were there I think the answer would be clear. What I see is If I buy something for \$10 and want to sell for 25% more than I bought it for, do I multiply by 1.25 or divide by .75? You bought it for \$10.00, and 25% of \$10.00 is \$2.50. Hence you want to sell it for \$10.00 + \$2.50 = \$12.50. In other words 1.25 \$10.00. Dividing by 0.75 gives you the answer to an entirely different question. Suppose that you bought it from Sam for \$10.00 and sold it to Fred for some amount that you didn't tell Sam. Sam asked Fred "What did you pay for it?" Fred answered "You got 75% of what I paid". That is the \$10.00 that Sam got was 75% of what Fred paid. Hence \$10.00 = 0.75 (what Fred paid) Thus what Fred paid is  \$10.00/0.75 = \$13.33 When you have a percentage question you really need to ask "percentage of what?" Cheers, Penny Go to Math Central