A decision must be taken about the number of books that should be printed in a first edition. Fixed costs are known to be 6,000 and the cost per book is 9. Each book can be sold for 30. Furthermore, it is known that as per table below, where "d" is the number of books required.

P (d<300)	0,01
P (d<400)	0,25
P (d<800)	0,5
P (d<1200)	0,75
P (d<2000)	0,99

What is the number of books to be printed in a first edition?