1. A company has the following items for the fiscal year 2020:

• Cash balance at the beginning of the year = 50 million
• Net cash flow from operating activities = 450 million
• Net cash used in investing activities = - 500 million
• Net cash from financing activities = 100 million

Calculate the companys cash balance at the end of this year

(You need to show (1) the formula and (2) your calculation process.)