The average adult dose of Vancocin is $100\mathrm{????}\mathrm{????}$ every $9$ hours or $10\mathrm{????}\frac{\mathrm{????}}{\mathrm{????}}\frac{\mathrm{????}}{?}$ day for a child greater than one year old. If the child weighs $90\mathrm{????}\mathrm{????}\mathrm{????}$ and is $3$ years old, what is the mglday?