Posted by **kim** on Thursday, July 7, 2011 at 8:43pm.

this is grade 10 math questions

a rectangular window is 5 feet 3 inches in length, and 3 feet 6 inches in width. if the perimeter of the window must have caulking that costs 32cents per inch, how much will the caulking cost??

the answer is $67.20

but i got 846.73 :(

what i did was

5ft=60inch legth= 60 + 3 = 63inches

and for the width

3ft=36inches width= 36 +6 = 42inches

42 x 63 =2646

2646 x 0.32= 846.72

plzz tell me what i did wrong

- math plzzzzzzz help -
**Ms. Sue**, Thursday, July 7, 2011 at 8:46pm
You found the area, not the perimeter.

P = 2L + 2W

- math plzzzzzzz help -
**jnani**, Sunday, August 21, 2011 at 12:10pm
perimeter=2*5feet3inch + 2*3feet6inch

=17feet6inch (1feet=12inch)

total inches = 17*12+6

= 210 inches

210*0.32=67.20

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