Answer:
I believe it would be 21 units . dont let extra line's confuse you just pay attention to the letters its asking for
(2x10)+(4x1)+(3x1/10)+(5x1/100)+(7x1/1000)
<span>1/10,1/100,1000 are fractions
Hope I Helped!!!</span>
12/99 is the fraction form