The numbers that we know are as follows:
U.S. RDI for Vitamin A is 5000 IU
1 RE = 10 IU from plant foods
1 RE = 6 mcg of beta carotene
So, 5000 IU of Vit A = 500 RE = 3000 mcg of beta carotene
If it is required that your product supplies 90% of the U.S. RDI for Vitamin A, that would be 4500 IU or 450 RE or 2700 mcg beta carotene.