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Use the 'graphical method' of solving linear programming problems for these questions. Show the tables that were use to construct the linear programming equations / inequalities wherever required. 1. Two types of coal (No. 1 and No. 2) are blended to be used as the fuel for a thermal power plant. The characteristics of these two coals are listed in the table 1 below. The furnace requires a maximum sulfur content of 0.025% and a minimum heat content of 214.19103 J/kg. Determine the best blending combination of these two coals to minimize the cost. Please formulate the LP model. Hints: let x1= proportion of No. 1 coal and x2= proportion of No. 2 coal Table 1: Coal properties and cost