1.	Find 50% of 80 mentally.
		A.	40	B.	4
		C.	20	D.	160
		Hint
	2.	Find 60% of 30 mentally.
		A.	50	B.	24
		C.	12	D.	18
		Hint
	3.	Estimate 73% of 16.
		A.	12	B.	8
		C.	10	D.	14
		Hint
	4.	Estimate 60% of 92.
		A.	42	B.	54
		C.	48	D.	60
		Hint
	5.	Find of 99 mentally.
		A.	33	B.	297
		C.	9	D.	11
		Hint