Below are income statement and balance sheet for Mercurial Enterprise Bhd.. for 2020 (in RM thousand) Mercurial Enterprise Bhd Income statement as at 2020 RM '000 Sales 600 Cost 480 Taxes (20%) 24 Net income 96 Dividends 40 Retained Earnings 56 Mercurial Enterprise Bhd Income statement as at 2020 RM '000 Current Assets 200 Net fixed assets 300 Total Asset 500 Payables 50 Long term debt 100 350 Shareholders equity Total Liabilities & Equity 500 Assumes that Mercurial Enterprise's proportions of costs and assets to sales are fixed and optimal. Required: (a) Assuming the firm adopts a fixed dividend payout policy, what is the firm's internal growth rate (IGR)? (3 marks) (b) Assuming the firm has a fixed capital structure, what is the firm's sustainable growth rate (SGR)? (1 mark) (c) If Mercurial Enterprise's sales in 2021 is expected to grow at 15%, given it is operating at full capacity, and its dividend payout policy is fixed, what is the firm's external financing needed (EFN) for 2021? (Hint: use the EFN formula). (4 marks) (d) However, if Mercurial Enterprise were operating at 90% capacity in 2020, recalculate its external financing needed (EFN) for 2021, if all other factors remain unchanged? Briefly explain the EFN, given that the expected 15% sales growth rate compared to the computed IGR in (a)