please assist. i already know the answer but i need an explanation on how it was calculated

10. The following lists all assets and liabilities of Literally Financial Limited at the dates indicated. Assuming there were no shares issued, no dividends paid and no assets revalued during the year ended 30th June 2017, how much profit was made in that year? 30/6/16 30/6/17 Cash $ 25,000 $50,000 Inventory $ 30.000 $45.000 Equipment $160.000 $160.000 Accounts payable $ 25.000 $35,000 Accrued Expenses $ 35,000 $25.000 Prepaid Rent $ 15,000 $20.000 A. $15,000 B $120,000 C. $30.000 $45.000 E. None of the above