The amount paid by Party A is 1/2 of Party B, and the amount paid by Party A is 1/3.

The amount paid by Party B is 1/3 of the amount paid by Party A, and the amount paid by Party B is 1/4 of the total amount.

The amount paid by Party C is 1/4 of Party A and Party B, and the total amount paid by Party C is 1/5.

So Ding paid the total amount of1-1/3-1/4-1/5 =13/60.

The total amount of money is 1.3/( 13/60)=6 yuan.

So A handed in 6/ 1/3=2 yuan.

B 6* 1/4= 1.5 yuan has been paid.

C Paid 6* 1/5= 1.2 yuan.