A wholesale dealer of stationary product plots the diagram of his income through the year 1985 to 2000.in which year was his income the highest?

To determine in which year the wholesale dealer's income was the highest, we need to look at the diagram of his income from 1985 to 2000. The year with the highest point on the diagram represents the year with the highest income.

Without the actual diagram, it is not possible to determine the exact year in which the wholesale dealer's income was the highest. However, by analyzing the data provided in the diagram, we can identify the year with the highest income.

The text does not provide a diagram to determine the year in which the dealer's income was the highest.