Trouble in solving this sum. Can u please help?

A square open reservoir of depth 2.5 meters contains 28900 liters of water inside . How much money will be spent to put a lead sheet in the inner side at $1250 per square meters ?
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1 Answer

deep=2.5 meters, volume=28,900 liters=28.9 meter^3

area=28.9/2.5=11.56

leng=wide=root(11.56)=3.4 meter

1 wall=3.4*2.5=8.5 sq meter

4 walls=34

add in bottom...34+11.56=45.56

kost=12.50*45.56=569.5$
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