Jack purchased two chairs at a discount of 50%. Sally purchased a table at a discount of 80%. Jack spent more on his two chairs than Sally did on her table. If Jack had purchased his two chairs at a discount of 60%, he would have spent less than Sally. If z represents the undiscounted price of Sally's table, which of the following could be the average undiscounted price of Jack's two chairs, in terms of z?
Choose the correct choice.
A) 0.25z
B) 0.22z
C) 0.19z
D) 0.15z
E) 0.13z
Let the average undiscounted price of Jack's two chairs be x, so 2 undiscounted chairs cost 2x.   Jack purchased two chairs at a discount of 50% --&gt; he paid 0.5*2x = x.   Sally purchased a table at a discount of 80% --&gt; she paid 0.2z.   Jack spent more on his two chairs than Sally did on her table --&gt; x &gt; 0.2z. Eliminate options C, D and E.   If Jack had purchased his two chairs at a discount of 60%, so for   0.4*2= 
<gadget id="calculator">  0.4*2</gadget>
<output>0.8</output>
0.8x, he would have spent less than Sally --&gt; 0.8x &lt; 0.2z --&gt; x &lt; 0.25z. Eliminate A.   Answer: 0.22z.
<result>B</result>
Jack purchased two chairs at a discount of 50%. Sally purchased a table at a discount of 80%. Jack spent more on his two chairs than Sally did on her table. If Jack had purchased his two chairs at a discount of 60%, he would have spent less than Sally. If z represents the undiscounted price of Sally's table, which of the following could be the average undiscounted price of Jack's two chairs, in terms of z?