Type the correct answer in the box. Use numerals instead of words. If necessary, use / for the fraction bar(s). The table shows the annual sales revenue for different types of vehicles from four automobile manufacturers.

The difference of the relative frequency of revenue earned by B & B Motors from sales of convertibles compared with the total revenue of all four companies and the relative frequency of revenue earned by B & B Motors from sales of mini trucks compared with the total revenue of all four companies is _
. Write your answer rounded to two decimal places.