hello I have to find the volume in metres cubed and in litres cubed of an above ground swimming pool. the surface area of the pool is of an axis 2 metres and 3 metres.the depth is 1.3 metres. so 2 times 3 times 1.3m=7.8 metres cubed. how to find how many litres correct to the nearest 10 litres? I need answer in about 24 hours thanks.