You need to say which type of dollar you want to convert from or into. There are many different currencies in the world called "dollar". For example, Singapore dollar, Canadian dollar, Australian dollar.
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400
400
5% of $400 = 5% * 400 = 0.05 * 400 = $20
"Three million, two hundred eighty thousand dollars"
30% off of 400 dollars = 70% of 400 dollars = 400*70/100 = 280 dollars