21 Note - Puzzle

Challange!
100 ka change lia shop keeper ne 21 note diye, ye btao k shop keeper ne 1,2,5,10,50 k kitne kitne note diye?
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Possibility 1
50 1
10 1
5 3
2 9
1 7
by lAi
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Possibility 2
1 x 12
2 x 4
5 x 2
10 x 2
50 x 1
by Suhel
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Possibility 3
50 10 10 5
2 2 2 2 2 2 2 2
1 1 1 1 1 1 1 1 1

50 x 1 = 50
10 x 2 = 20
5 x 1 = 5
2 x 8 = 16
1 x 9 = 9
by (abro)