Abox of chalk and 2 staplers cost $10. three boxes of chalk and 2 staplers cost $18. find the total cost of 1 box of chalk and 1 stapler.

Here is the solution of the given problem above:
Let s= staples 
c = chalk

c + 2s = 10 
3c + 2s = 18 

-c-2s = -10 
3c + 2s = 18 

2c = 8 

c = 4 
s = 3 
Therefore, the price per chalk box is $4 and per stapler is $3.
So the total cost of the chalk and stapler would be $7. 
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The correct answer would be "convenience"