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43 3/4

Explanation:

You need to subtract 78 21/100 by 34 23/50. The first thing you do is convert the mixed number into a improper fraction. Your equation would know read 7821/100 - 1723/50. So now you just subract the fractions, whichs leaves you with 1745/4 and hat siplifies to 43 3/4    

43 3/4

Explanation:

78 21/100=78.21

34 23/50=34 46/100=34.46

78.21-34.46=43.75=43 3/4

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