Pls solve the questoin number 14 with explantion

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Dear Student
Given that
Length of the wall = l = 9 m
Breadth of the wall = b = 8 m
Height of the wall = h = 6 m
Thus, Area of 4 walls = 2h(l + b)
                                   = 2 x 6 (9 + 8)
                                   = 12 x 17
                                   = 204 sq. mtrs.
Also Given that,
Length of 1 door = l1 = 3 m
Breadth of 1 door = b1 = 1.5m
Thus, Area of 2 doors = 2(l1×b1)
                                     = 2 (3 x1.5)
                                     = 2 x 4.5
                                     = 9 sq. mtrs
Length of 1 window = l2 = 1.5 m
Breadth of 1 window = b2 = 1 m
Area of 4 walls = 4(l2×b2)
                            =4​​​​​​​​​×( 1.5 x 1 )
                           = 6 sq. mtrs
Area of wall that is to be whitewashed = (204 - 9 - 6) sq. mtrs.
                                                              = 189 sq. mtrs
Cost of whitewashing @Rs 1.75/sq. mtr. = Rs (189 x 1.75)  
                                                                 = Rs 330.75

​​​​​​​Regards

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