Among the four numbers 3.1{_{5}**(•)}, (7/2), 3.05, and 35%, what is the difference between the largest number and the smallest number?
在3.1{_{5}**(•)}，(7/2)，3.05，35%四个数中，最大的数与最小的数相差多少．
<result>3.15</result>