math .please help its worth alot of my grade :s
posted by amy .
The rectangular base of a box has a perimeter of 60cm. The base is twice as long as it is wide. Saskia plans to cover the top and bottom with coloured paper;which cost 5 cents per square centimetre. She lans to cover the other 4 faces with white paper; which costs 1.5 cents per square centimetre. How much money will Saskia spend to cover the box with paper?(assume there is no waste)
height is 40 cm .

How far have you gotten in trying to solve this problem?

i honoustly havent gotten anything done because i don't understand this at all Ms.Sue

Let the width be x
Then the length is 2x
so, 2(x+2x) = 60
6x = 60
x = 10
so, the box is 10x20
The area of the top is 10*20 = 200, as is the bottom.
There are two sides 10x40 = 2*400 = 800
and 2*20*40 = 1600
top and bottom cost 400*.05 = $20
faces cost .015*2400 = $36
Total cost: $56 
thank you so much steve