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75 mg = .075 g.
(75)/(100+75)x100% = 41.28% by mass
75 g of Gold, everything else are impurities
75 g is 1/32000 (one-thirty two thousandth) of 2400 kg.
im sorry but this is an easy one 75 is NOT less than 1 gram grams=g so 75g<1g? no 75g>1g that's better but yea hope u know it now :P