RST Ltd. reports the following financial data for the year ending 31-03-2022:

Current Assets:

• Cash: $2,20,000
• Sundry debtors: $7,50,000
• Short term investment: $1,75,000
• Stock: $20,00,000
• Prepaid expenses: $45,000

Current Liabilities and Equity:

• Current liabilities: $10,00,000
• 9% Debentures: $14,50,000
• Equity share capital: $21,00,000
• Retained earnings: $12,00,000

Profit & Loss Statement:

• Sales (50% cash sales): $90,00,000
• Less: Cost of goods sold: $65,00,000
• Profit before interest & tax: $25,00,000
• Less: Interest: $2,10,000
• Profit before tax: $22,90,000
• Less: Tax @25%: $5,72,500

Net Profit: $17,17,500

Calculate: (i) Current ratio, (ii) Fixed charge coverage ratio, (iii) Return on equity, and (iv) Inventory conversion period.