Homework Help: Math

Posted by Louis on Wednesday, February 6, 2013 at 10:51pm.

1 litre can of paint covers 11m squared. How many cans of paint would you need to cover a perfectly square ceiling that has a side length of 5.2 m?

If paint caosts $29.95 per can and there is a 12% tax. How much would it cost to paint the ceiling?

Math - Louis, Wednesday, February 6, 2013 at 10:57pm
Hold it! im going to try this myself but i want someone to check if i did it right:

5.2 x 5.2 = 27.04

11 x 3= 33
You would need 3 cans of paint.

27.04 x 3 = 81.12

ok now im stuck... how do you do this part::If paint caosts $29.95 per can and there is a 12% tax. How much would it cost to paint the ceiling?
Math - Ms. Sue, Wednesday, February 6, 2013 at 10:58pm
5.2 * 5.2 = 27.04 square meters

27.04 / 11 = 2.46 = 3 cans of paint

(3 * 29.95) * 1.12 = ?
Math - Louis, Wednesday, February 6, 2013 at 11:02pm
OOPS oh so is this how you do it:: 29.95 x 3= 89.85x 1.12 = $100.632

i just have one question: where did the 1.12 come from?
Math - Ms. Sue, Thursday, February 7, 2013 at 11:11am
1.12 = 112%

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