Number of unit sold by company B in the year 2005 is what percent of the total number of units sold by all the companies together in the year?

In 2005, total number of units sold by all the companies = Total number of units sold by ( Company A + Company B + Company C + Company D + Company E + Company F )
In 2005, total number of units sold by all the companies = 143 + 85 + 100 + 78 + 154 + 120 = 680
Hence, required percentage = Number of units sold by company B x 100/ Total number of units sold by all the companies in 2005
Hence, required percentage = 85 x 100 /680 = 12.5%