None.
A kilogram is a measure of mass while a dollar is a measure of monetary value. The two measure different things and, according to basic principles of dimensional analysis, conversion from one to the other is not valid.
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You have to be totally ignorant of the mass of a dollar bill or a kilogram (or both).
999 + 781 = 1780
781/1,000 is.
781/1000 is already in its simplest form
Heck, one killogram, I bro you, is a kilogram, dummy.