Based on the cost of the bottle, the price of the bottle can be determined by a markup percentage.
In order to determine the price of the bottle, you should use a markup percentage which will be based on your required profit level.
For instance, if you want to make a 40% profit on the cost then use a 40% markup to find the price as:
= Cost of bottle + (Cost of bottle x 40%)
Solving gives:
= 6.50 + (6.50 x 40%)
= $9.10
In conclusion, use a markup percentage.
Find out more on markup percentages at https://brainly.com/question/5189512.