606
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18.0769
600 + 50*10 + 0*1 = 600+500 = 1100
15 638 can be made with 1 ten, 5 ones, 6 hundreds, 3 tens, and 8 ones; 1 ten, 8 ones, 6 hundreds, 3 tens, and 5 ones; or 6 ones, 5 hundreds, 3 tens, 8 ones, and 1 ten.
There are 0.06 of them.
500 + 680 + 031 ------- 1,211