P/M vs P/V, by mass, selected density

`"Item B in " $/(kg) = ( "BPrice" )/( "BVolume" * "the density of " "BDensity" )`

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This equation is intended to help you save money by comparing the price/mass of items to determine which is the better buy. One of the items is described with a density selected from a list of examples to convert the volume to mass for comparison. For more equations like this, check out https://www.vcalc.com/wiki/TylerJones/Price+Comparison+Calculator