Connie calls the sandwich shop to order sandwiches for herself and two friends. She orders the lunch special for $6.83, a bowl of chili for $4.59, and a ham sandwich for $5.99. Connie collected a total of $20 to pay for the food. Which statement best describes whether an exact total or an approximate total should be calculated? A. Connie can round the prices of the lunch items to the nearest dollar and then add to estimate if she has enough money. B. Connie must add the 3 amounts exactly so she will know if she has to collect more money to pay for the food bill.