If john makes a contribution to a charity fund at school, the average contribution size will increase by 50% reaching $75 per person. If there were 2 other contributions made before john's, what is the size of his donation?  Pick:
A) $125
B) $150
C) $200
D) $250
E) $450
Cavg = average contribution before John   Cavg*1.5 = 75, therefore the average cont is $50 before John.   If he needs to increase the average contribution by $25, he must put in $25 for each of the 2 people.   so $50.   But, he also has to put in the average for himself (the threeth person), so add $75.   So $125 is your answer.   $125nswer $125
<result>A</result>
If john makes a contribution to a charity fund at school, the average contribution size will increase by 50% reaching $75 per person. If there were 2 other contributions made before john's, what is the size of his donation?