Profit made by Company A in the year 2004 was what percent of the total profit made by all the three companies in that year?

% Profit made by Company A in the year 2004 = (profit made by A in 2004) x 100/Total profit made by other all 3 companies.
% Profit made by Company A in the year 2004 = 5 x 100/(3 + 5 + 8 ) = 5 x 100/16 = 31.25%