Answer:
Wages Expense = 11.25%
Explanation:
Under a common size income statement, all the accounts are based on a percent of sales. That way, it makes the analisys more easy to evaluate the impact of each financial line on the net income.
For 2018 wages expense
The percentage attributable for wages expense will be:
wages expense 90
sales 800
90/800 = 0,1125 = 11.25%
This is repeated for every line on the income statement.