Logic Puzzle!!

One Teacher has 9 students

He gave them

1- 20 Balls

2- 30 Balls

3- 40 Balls

4- 50 Balls

5-60 Balls

6-70 Balls

7-80 Balls

8-90 Balls

9 - 100 Balls

He told to his students that the selling price of the ball remain same.

and the revenue should also be remain same.

means revenue from 20 Balls

and 100 Balls should remain same???

with the same selling price???

Solution!!!

First day SP will be 11 Balls for 1 rs.

20-11 = 9 Balls Left, Rev= 1

30-22 = 8 BL,r= 2

40-33= 7 BL, r= 3

50-44 = 6 BL, r= 4

60-55 = 5 r=5

70-66= 4 r=6

80-77= 3 r= 7

90-88 = 2 r= 8

100-99 = 1 r=9

Second day SP will be 1rs for 1 balls.

Rev= 1+9= 10

2+8= 10

3+7= 10

4+6= 10

5+5= 10

6+4= 10

7+3= 10

8+2= 10

9+1= 10

Sp Sp is same and rev is same.....