Can you please show me the solution step by step and also included the whole calculation ; i need to understand the solution to solve another one on my own ,

CADET COMPANY Comparative Balance Sheets December 31
		2012	2011
Assets		78700	33400
Cash		72790	37000
Accounts Receivable		121900	102650
Long Term Investments		89500	107000
Plant Assets		320000	205000
Accumulated Depreciation		49500	40000
Total		633570	445050
Liabilities&Stockholders Equity
Accounts Payable		57700	48280
Accrued Expense Payable		15100	18830
Bonds Payable		140000	70000
Common Stock		250000	200000
Retained Earnings		170770	107940
Total		633570	445050
CADET COMPANY Income Statement Data December 31 2012
Sales			294500
Gain on Sale of plant assets			3000
			297500
Less:
COGS		104460
Operating Expenses, excluding deppreciation expense		14670
Deppreciation Expense		35500
Income Taxes		32100
Interest Expense		2940	189670
Net Income			107830
1) New plant assets costing 151000 $ were purchased for cash during the year
2)Investments were sold at cost
3)Plant assets costing 36000 $ and accumulated deppreciation of 26000 $ were sold for 13000 $
4)A cash dividend of 45000 $ was declared and paid during the year