Question

Shannon paid $57.25 for 28 pounds of potatoes. Shannon estimated the cost per pound to be $3.00. What is her error?
Shannon rounded $57.25 to $40 and 28 pounds to 20 before dividing.
Shannon rounded $57.25 to $60 and 28 pounds to 20 before dividing.
Shannon rounded $57.25 to $40 and 28 pounds to 30 before dividing.
Shannon rounded $57.25 to $60 and 28 pounds to 40 before dividing.

Answer 1

Answer:

Option B - Shannon rounded $57.25 to $60 and 28 pounds to 20 before dividing

Step-by-step explanation:

Now for the amount that Shannon has paid for 28 pounds, the cost of one pound of potatoes can be easily calculated as

$(57 + 0.25) \div 28 = (57 \div 28) + (0.25 \div 28)$

which turns out to be $2.044 per pound of potatoes.

But what Shannon has wrongly estimated is $3.00 per pound of potatoes.

Which means that she has rounded off the amount she actually paid and/or the total number of pounds she has bought.

Going by the options:

1) 57.25 rounded off to 40. 28 pounds rounded off to 20

that means cost per pound stands to be 40/20 = 2

Which is not what Shannon has estimated as

and hence is not the correct option.

2) 57.25 rounded off to 60. 28 pounds rounded off to 20

that means cost per pound stands to be 60/20 = 3

Which is exactly what Shannon has wrongly

estimated as and hence is the correct option.

3) 57.25 rounded off to 40. 28 pounds rounded off to 30

that means cost per pound stands to be 40/30 = 1.33

Which is not what Shannon has estimated as

and hence is not the correct option.

4) 57.25 rounded off to 60. 28 pounds rounded off to 40

that means cost per pound stands to be 60/40 = 1.5

Which is not what Shannon has estimated as

and hence is not the correct option.

So, the correct option is the second option.

Answer 2

Answer:

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