To Target Sum of 100 Exactly .
By shooting the right different numbers in four shots summing upto 100.
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the last digit of the 4 numbers has to add to something congruent with 10,
only a few combinations can work off the bat. For example,
15, 23, 12, 30: 5 + 3 + 2 + 0 = 10
But this one doesn't work. Looking at more that do, I found
44 + 23 + 18 + 15 = 100
Which is the answer.