The average cost of some pen tab is Rs. 2,500 while the average cost of some white boards is Rs. 1,200. If the average cost of both the items (pen tab and white board) is Rs. 2,000, then find the percentage of number of white boards out of the total items. (Correct to two decimal places)
1
40.46%
2
39.46%
3
38.46%
4
35.46%