A man bought pens at 3 for a dollar. How many for a dollar must he sell to gain 50%?	Pick one.
A) 3	B) 1	C) 2	D) 4	E) 5
C.P. of 3 pens = $1   S.P. of 3 pens = 150% of $1 = 3/2   for $3/2 pens sold = 3   for $1 pens sold = 3*2/3= 
<gadget id="calculator">3*2/3</gadget>
<output>2</output>
2   Answer is 2
<result>C</result>
A man bought pens at 3 for a dollar. How many for a dollar must he sell to gain 50%?