Question

A two pound box of spaghetti costs $2.50. Philip says that the unit cost is 2/2.50 =$0.80 per pound. Explain his error

Answer 1

2.50 / 2 = 1.25 not .80 It also looks like you are trying to divide the spaghetti boxes by the price, when it should be price by number of boxes.

Answer 2

Find out the Philip error.

To prove

As given

A two pound box of spaghetti costs $2.50.

`Philip\ says\ that\ the\ unit\ cost\ is\ (2)/(2.50) is\ equal\ 0.80\ dollar\ per\ pound.`

Philip calculated the unit cost by wrong method he divided weight by the cost which is wrong.

2 pound box of spaghetti costs = $2.50

`one\ costs\ of\ box = (Total\ cost\ of\ two\ pound\ cost)/(Total\ pounds)`

`unit\ cost\ of\ box = (2.50)/(2)`

unit cost of box = $1.25

Therefore the unit cost of box is $1.25 .