Calculate the quantity of each ingredient needed to prepare 30-mL of the following ophthalmic solution. The first two ingredients to be in mg, the last two in mL; do not include units in your submitted answers (if needed, you will need to put qs or ad before the final liquid ingredient).

Erythromycin Lactobionate 500 mg
Dexamethasone Sodium Phosphate 100 mg
Glycerin 2.5 mL
Sterile Water for Injection ad 100 mL