If you were to log in, you'd be able to get more information on your fellow community member.
"...Europeans worked 'almost 50 per cent less', 18 hours per week instead of 25 hours per person of working age. ... I'm not sure how the math works out. Fifty percent of 25 would be 12.5, no?" The original writer probably wrote, "American worked 50% more than Europeans, 25 hr instead of 18hr;" an inattentive editor then switched it around carelessly.