A school has received 50% of the amount it needs for a new building by receiving a donation of $400 each from people already solicited. People already solicited represent 40% of the people from whom the school will solicit donations. How much average contribution is requited from the remaining targeted people to complete the fund raising exercise?
Select the correct option
A) $400	B) $177.78	C) $320	D) $277	E) $200
Let us suppose there are 100 people. 40% of them donated $16000 ( 400 * 40 )   $16000 is 50% of total amount.   So total amount = 16000 * 100/50   Remaining amount is 50% of total amount.   50% of total amount = 16000 * (100/50) * (50/100)= 
<gadget id="calculator">16000 * (100/50) * (50/100)</gadget>
<output>16_000</output>
16000   This amount has to be divided by 50 ( remaining people are 50 )   So per head amount is  16000 / 50= 
<gadget id="calculator"> 16000 / 50</gadget>
<output>320</output>
320   ANSWER:$320
<result>C</result>
A school has received 50% of the amount it needs for a new building by receiving a donation of $400 each from people already solicited. People already solicited represent 40% of the people from whom the school will solicit donations. How much average contribution is requited from the remaining targeted people to complete the fund raising exercise?