This question is based on the density of the two substances. Density is defined as mass per volume. Thus,
Density = Mass / Volume
Using this formula, the density of the coconut oil is:
92.4 grams / 100 mL = .924 grams/ milliliter
Likewise, the density of the gasoline will be:
36.8 grams / 50 milliliters = .736 grams / milliliter
Substances that have a lower density will float on substances that have a higher density (or, substances that are more dense sink). This is why the oil in your salad dressing floats on top of the vinegar and water.
When two or more substances create layers based on differences in densities, it is called a density column.
Thus, the gasoline will float on top of the coconut oil since, in this instance, the gasoline has a lower density.