SOLUTION: In a year a man smokes about 2.5kg of tobacco at 75p for 50g and 6000 cigarettes costing 31p for 20. What is his average weekly expenditure on smoking?

Algebra ->  Functions -> SOLUTION: In a year a man smokes about 2.5kg of tobacco at 75p for 50g and 6000 cigarettes costing 31p for 20. What is his average weekly expenditure on smoking?      Log On


   

Question 1117887: In a year a man smokes about 2.5kg of tobacco at 75p for 50g and 6000 cigarettes costing 31p for 20. What is his average weekly expenditure on smoking?
Answer by Boreal(15235) About Me  (Show Source):
You can put this solution on YOUR website!
In a year, the cost of tobacco is 50/75=2500/x
50x=2500*75
x=50*75=3750p
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6000/20=x/31
x=300*31=9300p
Total is 13,050p
52 weeks in a year
divide 13050/52=250.96 or 251 p per week.
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Check
in a week, just over 48 gm of tobacco or nearly 75 p
in a week, just over 115 cigarettes or nearly 186 p
that adds to 261 p, above the answer consistent with the two parts being slight overestimates.