Answer:
A vertical analysis income statement uses Sales as a base and makes everything else a percentage of sales.
                      Vertical Analysis Statement
                           Amount           Percentage
Sales                    $1,500,000             100%
Cost of Goods sold         ($900,000)              60%
Gross Profit                $600,000              40%
Cost of Goods sold percentage = 900,000 / 1,500,000
= 60%
Gross Profit percentage = 600,000 / 1,500,000
= 40%