Vertical analysis common-size percentages for carla vista

Question

Problem

Vertical analysis (common-size) percentages for Carla Vista Co.'s sales revenue, cost of goods sold, and expenses are listed here.

Vertical Analysis

                                  2017         2016          2015

Sales revenue              100%        100%         100%

Cost of goods sold         61.8          64.1           65.9    

Expenses                        24.4         26.4            29.5

Calculate Carla Vista's net income as a percent of sales.