If the index crank of a dividing head is turned through

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If the index crank of a dividing head is turned through one complete revolution and 10 holes in a 30 hole Circle plate, the work piece turns through (in degrees)

1. 6
2. 12
3. 240
4. 480

Correct Option: B

By one complete revolution of indexing crank the work piece turned through

=	360	= 9
	40

and by 1/3 Rotation

=	9	= 3
	3

total rotation or turn of work piece = 9 + 3 =12°