PwC is making "tangible investments" to ensure the Big Four firm has high quality and sustainable business in China, it said in a memo to staff after Chinese regulators on Friday hit the company's mainland unit with a record penalty. PwC Zhong Tian LLP was hit with a six-month suspension and a fine of 441 million yuan ($62 million) on Friday over the firm's audit of failed property developer China Evergrande Group . Chinese authorities have been examining PwC's role in Evergrande's accounting practices since the country's securities regulator accused the developer in March of a $78 billion fraud over a period of two years through 2020.