helpProblem Solving with Units
Consider the following exam question and student solution. Determine whether the solution is correct. If it is notcorrect, write a
note to the student explaining why it is wrong and give a correct solution.
Examquestion: You can buy a 48-pound bag of flour for $8 or you can buy a 1-pound bag for $0.41. Compare the per pound cost
for the large and small bags.
Student solution: The large bag price is 48÷$8 =$6.00 per pound, which is much more than the 41¢ per pound price of the small
bag.
Select the correct choice below and if necessary, fill in the answer box to complete your choice.
A. The students solution is correct.
B. The students solution is incorrect. The students division gives an answer with units of pounds per dollar, but he should seek
an answer in dollars per pound. The answer in dollars per pound is ——$ per pound, which is less than the $0.41 per pound for
the smaller bag.
(Round to the nearest cent as needed.)
C. The students solution is incorrect. The student should have converted 41¢ per pound to dollars per pound before writing the
exam solution. He should have converted 41¢ cents per pound to ——–$ per pound.
(Round to the nearest cent as needed.)
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