The base of the tank (10.5x7.5x7.5) needs to have 3 cm deep gravel. Gravel costs $5 for 500g bags from the pet store.
Calculate the volume of gravel required to cover the base on your tank to a depth of 3 cm.
If gravel has a density of 2.5 g/cm3, calculate the weight of gravel
Now calculate the cost of gravel needed.
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