2.5 tons = 2.5*109 mg = 2,500,000,000 mg. Simple!
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0.25 = 25/100 = 1/4
There is not enough information given to answer this question. 0.4mg is what percentage of what quantity?
12/25 IS a fraction.
The percent of change -25%
1/4 = 25/100 = .25