Answer:
Changes in sales levels is not an important aspect of this method.
Explanation:
Percent of sales method follows some static steps as follows:
Every item in the income statement whether in contribution format, or in any other format shows the item as a percentage of sales, and therefore, if there is any change in the level of sales it will impact widely on the entire statement.
Thus, it is a crucial part of percent of sales method, and cannot be avoided in any manner.