Suppose the number in the original percentile is x, then the number in the decile is X+2. According to the topic, after the number on the decile and the number on the percentile are exchanged, the relationship between the two numbers is as follows: X+(X+2)=6, the result is X=2, the number on the decile is 4, and the number of units is 6/2=3. So the original two decimal places were 3.42.