Subject: mathqa
Question: 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 ?
Option: 
A: $ 277
B: $ 400
C: $ 177.78
D: $ 320
Answer: D