On January 1, a company had these assets, liabilities, and equities: Cash $100 Inventory $140 Accounts payable $70 Paid-in capital $150 Retained earnings $20 During the year, the company entered into these transactions: Selling inventory costing $140 for a total of $200; cash of $30 was received, and the remaining $170 was put on account. Paying cash for rent of $45. Paying cash dividends of $30. What is this company's total equity at the end of the year?

The answer is $155 but I dont understand why??

Please explain why?????