If 40% of a certain number is 160, then what is 20% of that number?	Choose the correct option.
A) 75 B) 100 C) 120 D) 30 E) 80
80xplanation:   40% = 40*4= 
<gadget id="calculator">40*4</gadget>
<output>160</output>
160   20%= 20*4= 
<gadget id="calculator">20*4</gadget>
<output>80</output>
80   Answer: Option 80
<result>E</result>
If 40% of a certain number is 160, then what is 20% of that number?