using Uber Technologies most recent $10-$K answer the following:

A$.$Prepare a common size income statement for the three years presented. In addition, calculate sales growth and operating expense growth for each two$-$year period presented, as well as effective tax rates for all three years.

$$ B$.$Analyze the income statement of the company. Write a summary that includes important points that an analyst would use in assessing the profitability of the firm.