A school has received 80% of the amount it needs for a new building by receiving a donation of $600 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? Choose the most appropriate option
A) $200 B) 100 C) $105 D) $250 E) $300
Let us suppose there are 100 people. 40% of them donated $ 24000 ( 600 * 40 )   $24000 is 80% of total amount.   So total amount = 24000 * 100/80   Remaining amount is 20% of total amount.   20% of total amount = 24000 * (100/80) * (20/100)= 
<gadget id="calculator">24000 * (100/80) * (20/100)</gadget>
<output>6_000</output>
6000   This amount has to be divided by 60 ( remaining people are 60 )   So per head amount is  6000/ 60= 
<gadget id="calculator"> 6000/ 60</gadget>
<output>100</output>
$100   ANSWER:100
<result>B</result>
A school has received 80% of the amount it needs for a new building by receiving a donation of $600 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?