For calculating trend percentages at the time of analysis of financial statements, any year is selected as:

Base year

The correct answer is option 3- Base year.

Trend Analysis is a technique of studying the operational results and financial position over a series of years. Using the previous years’ data of a business enterprise, trend analysis can be done to observe the percentage changes over time in the selected data. The trend percentage is the percentage relationship, in which each item of different years bear to the same item in the base year. Trend analysis is important because, with its long run view, it may point to basic changes in the nature of the business. By looking at a trend in a particular ratio, one may find whether the ratio is falling, rising or remaining relatively constant.