By Jeffrey Quiggle A new study suggests a surprising result when asking shoppers how the “checkout charity” requests make them feel. A customer’s visit to a store will frequently involve a request to round the charge for a customer’s purchase up to the next highest even dollar amount. So a charge of $19.50 is rounded up to $20 and the $.50 difference goes to charity. The round-up charge is often set to repeat for that individual customer’s every visit to the store by associating a “yes” or “no” for the purchaser’s preference on whether or not to implement the donation. It is generally assumed …