Question

A metal worker wants to figure out the cost of making a rectangular iron bar. He knows that the required dimensions of the bar are 8.0 cm (width), 0.40 cm (height), and 310 cm (length).

If this kind of iron costs $0.015 per cm3, what is the cost of making the bar?

Answer 1

Dimensions of the bar are 8.0 cm (width), 0.40 cm (height), and 310 


Volume of the bar = width x height

                              = 8 x 0.4 x 310

                              = 992 cm³


If this kind of iron costs $0.015 per cm³, the cost = 992 x 0.015

                              = $14.88

Answer 2

Answer: The cost of making the bar $ 15.

Explanation:

width of the iron bar = 8.0 cm

Height of the iron bar = 0.40 cm

Length of the iron bar = 310 cm

Volume of the iron bar = length × width × height = 310 cm × 8.0 cm × 0.40 cm = $992 cm^3$

Cost of $1 cm^3$ of iron = $0.015

Then $992 cm^3$ of iron will cost = $992\times \ 0.015=\ 14.88\approx \ 15$

Hence, the cost of making the bar $ 15.