The formula to calculate the price per 100 mL (PP100mL) is:
\[ PP100mL = \frac{TP}{TV} \cdot 100 \]
Where:
Let's say the total price (TP) is $5 and the total volume (TV) is 250 milliliters. Using the formula:
\[ PP100mL = \frac{5}{250} \cdot 100 \]
We get:
\[ PP100mL = 2 \]
So, the price per 100 mL is $2.