Out of 20 boys, 6 are each of 1 m 15 cm height, 8 are of 1 m 10 cm and rest of 1 m 12 cm. The what is the average height of all of them?
[A] 1 m 12 cm
[B] 1 m 12.1 cm
[C] 1 m 21 cm
[D] 1 m 21.1 cm
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