"Introduction to Economics", "Laws of supply and demand", "Types of Efficiency", "Scope of engineering economics", "Sunk Costs, Opportunity Costs and Break-even Analysis", "PROFIT VOLUME RATIO (P/V RATIO)", "Elementary Economic Analysis", "Materials Selection for Great Products: ", "Process Planning", "The Make or Buy Decision", "Definition of Value Engineering", "Value engineering aims", "Equal-Payment Series Sinking Fund", "Financial Equations", "Uniform Annual Series and Future Value", "Uniform Gradient Uniform Series", "Effective Interest Rates", "FUTURE WORTH METHOD", "Annual equivalent method", "Annual equivalent method", "WORKEDOUT PROBLEMS", "cost dominated cash flow diagram", "Equivalent annual cost", "Compound Interest Formulas", "Factor Formulas", "The Meaning of Equivalence", "Time Value of Money (TVM) ", "Opportunity Cost", "Calculation of Break-Even Analysis", "Uses of Break even analysis" stringArrayList.add("Introduction to Economics"); stringArrayList.add("Laws of supply and demand"); stringArrayList.add("Types of Efficiency"); stringArrayList.add("Scope of engineering economics"); stringArrayList.add("Sunk Costs, Opportunity Costs and Break-even Analysis"); stringArrayList.add("PROFIT VOLUME RATIO (P/V RATIO)"); stringArrayList.add("Elementary Economic Analysis"); stringArrayList.add("Materials Selection for Great Products: "); stringArrayList.add("Process Planning"); stringArrayList.add("The Make or Buy Decision"); stringArrayList.add("Definition of Value Engineering"); stringArrayList.add("Value engineering aims"); stringArrayList.add("Equal-Payment Series Sinking Fund"); stringArrayList.add("Financial Equations"); stringArrayList.add("Uniform Annual Series and Future Value"); stringArrayList.add("Uniform Gradient Uniform Series"); stringArrayList.add("Effective Interest Rates"); stringArrayList.add("FUTURE WORTH METHOD"); stringArrayList.add("Annual equivalent method"); stringArrayList.add("Annual equivalent method"); stringArrayList.add("WORKEDOUT PROBLEMS"); stringArrayList.add("cost dominated cash flow diagram"); stringArrayList.add("Equivalent annual cost"); stringArrayList.add("Compound Interest Formulas"); stringArrayList.add("Factor Formulas"); stringArrayList.add("The Meaning of Equivalence"); stringArrayList.add("Time Value of Money (TVM) "); stringArrayList.add("Opportunity Cost"); stringArrayList.add("Calculation of Break-Even Analysis"); stringArrayList.add("Uses of Break even analysis"); if (selected.equals("Introduction to Economics")) { Intent i = new Intent(MainActivity.this, DetailActivity.class); i.putExtra("id", position); i.putExtra("url" , "file:///android_asset/1.htm" ); i.putExtra( "value", adapter.getItem(position)); startActivity(i); } if (selected.equals("Laws of supply and demand")) { Intent i = new Intent(MainActivity.this, DetailActivity.class); i.putExtra("id", position); i.putExtra("url" , "file:///android_asset/2.htm" ); i.putExtra( "value", adapter.getItem(position)); startActivity(i); } if (selected.equals("Types of Efficiency")) { Intent i = new Intent(MainActivity.this, DetailActivity.class); 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