As James bought his textbooks for classes one semester, he estimated the cost to the nearest ten dollars. He knew he could cover the cost up to $315. His math book cost $68.41, biology text was $105.35, literature text cost $72.49, and the AutoCAD text was $59.91. What rounded sum did James determine? Could he buy all his books at this time? Select one: a. $306.16; yes b. $310; yes c. $305; yes d. $320; no