Forty Bags for 'Good! Very Good!'

From D13.20.8, The Seventh Banquet. It illustrates D13.20.8.57–62:

D13.20.8.57
The Shah gave Bozorgmehr a ready ear,His heart rejoiced to see that sage so near.
D13.20.8.58
The king would give his largess in this way,By measured word, and richly, day by day:
D13.20.8.59
For “Good!” four bags were granted at his call;For “Good! Very good!” came forty bags in all.
D13.20.8.60
The treasurer kept count of every share:Ten thousand silver coins each bag would bear.
D13.20.8.61
The king had said, “Good! Very good!” that day;His words prescribed the sum the vaults would pay.
D13.20.8.62
The treasurer, with cheerful face and glad,Brought Bozorgmehr the forty bags he had.