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smoked 1 pack of cigarrettes a day for last 50 yrs.
Actually it's a little more complicated than what is answered above. Pack-years are calculated by multiplying the number of packs of cigarettes smoked per day by the number of years the person has smoked.
A pack-year is smoking 20 cigarettes a day for one year. If someone has smoked 10 cigarettes a day for 6 years, they would have a 3-pack-year history. Someone who has smoked 40 cigarettes daily for 20 years has a 40-pack-year history.
So it is actually possible for someone to have a pack-year history that is larger than their actual age.
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What is a 150 pack year history?
Smoking X cigarettes per day for Y years to equal 150. For example, smoking three packs per day for 50 years, or ten packs per day for fifteen years would each yield a 150-pack-year smoking history.
How did Ruby Bridges make history 50 years ago?
She went to an all white school
What was the resolution of World War 2?
The Nationalists lost, the Democracies won, the Communists had a 50 year breathing space.
What was the largest land-sea-air operation in history?
D-Day was the single largest Land-Sea-Air operation in Military history with more then 160,000 Allied troops landing along a 50 mile stretch of beach. 5,000 ships and 13,000 aircraft were along to support the landing.
What does economically justified mean?
It's simple. Imagine you import bikes from China. You pay a manufacturer $200 a piece (let's say you buy many bikes at once), than you pay more $50 a piece for shipment, more $50 at customs, more $10 for storage and more $15 for delivery from warehouse to your store. Now, if you can sell a piece for more than 200+50+50+10+15=$325 - it will be economically justified (theoretically)
