I need help with this

Great White North Bank Balance Sheet As at Dec. 31, 2017 Assets Liabilities Cash Reserves $ 20,000 Demand Deposits $100,000 Loans to Customers 50,000 Investment in Securities 30,000 Equity Fixed Assets 20.000 Shareholders' Equity 20.000 Total Assets $120,000 Total Liabilities & Equity $120,000 a. What percent of its demand deposits is this bank holding in cash reserves (the reserve ratio)? (1 mark) b. If a deposit of $10,000 is made, how much of this is lent out to maintain the same reserve ratio? How much can bank deposits in the system potentially increase as a result? (2 marks) c. Show the balance sheet after the bank receives the $10,000 deposit and then makes loans from that deposit. (2 marks)