The sales of two kinds of bicycles B1 and B2 (in lakhs) manufactured by a company over a period of three years are shown in the table below.
From 2004 to 2006, what is the ratio of the total sales of bicycles B1 to the total sales of bicycles B2?
1
27 : 40
2
9 : 10
3
10 : 9
4
40 : 27