A school has raised 75% of the amount it needs for a new building by receiving an average donation of Rs. 600 from the parents of the students. The people already solicited represents the parents of 60% of the students. If the School is to raise exactly the amount needed for the new building, what should be the average donation from the remaining students to be solicited?

 

A. Rs. 300

B. Rs.250

C. Rs. 400

D. Rs.500

A. Rs. 300

Let the number of parents be x who has been asked for the donations. People already solicited = 60% of x = 0.6x Remaining people = 40% of x = 0.4x Amount collected from the parents solicited= 600 *0.6x = 360x

360x = 75%

Remaining amount = 25% = 120x

Thus, Average donations from remaining parents = 120x /0.4x = 300