To solve this problem, we need to convert the given dosage from milliliters (ml) to fluid ounces (fl oz) and then calculate the total amount of medicine needed for 8 days.
1. Convert 5 ml to fluid ounces:
1 ml is approximately equal to 0.0338 fluid ounces. So, to convert 5 ml to fluid ounces, we multiply 5 by 0.0338:
5 ml * 0.0338 fl oz/ml = 0.169 fl oz
So, each dosage of 5 ml is equal to approximately 0.169 fluid ounces.
2. Calculate the total amount of medicine needed for 8 days:
Since the dosage is given every 4 hours, we need to find how many dosages are required in 8 days.
First, find the number of hours in 8 days:
8 days * 24 hours/day = 192 hours
Then, divide the total hours by the duration between each dosage:
192 hours / 4 hours = 48 dosages
Since each dosage is 0.169 fluid ounces, we can find the total amount of medicine needed by multiplying the number of dosages by the dosage amount:
48 dosages * 0.169 fl oz/dosage ≈ 8.112 fl oz
Therefore, approximately 8.112 fluid ounces of medicine should be purchased.