⇒ Let the number of people be x who has been asked for donations. ⇒ People already solicited =60% of x=0.6x ⇒ Remaining people =40% of x=0.4x ⇒ Amount collected from the people solicited =600×0.6x=360x ⇒ Here, 360x is 75% of amount collected. ⇒ So, Remaining 25% amount =120x. ⇒ Thus, Average donation from remaining people =
Remaining amount
Remaining people
=
120x
0.4x
=300 ∴ Average donation from remaining people to be solicited is 300 .