How Important Is Cost Of Sales To Western Digital's Expenses And Overall Profitability?

Western Digital's (NASDAQ: WDC) total expenses have dropped gradually from around $18.7 billion in 2017 to about $17.32 billion in 2019. As a percentage of revenues, expenses have grown, going from 97.9% in 2017 to 104.6% in 2019. Cost of sales is the biggest expense head for the company...