Answer :

Given,


Dimensions of room = 12.5m ×9m × 7m


Dimensions of each door = 2.5m ×1.2m


Dimensions of each window = 1.5m ×1m


Area of four walls including doors and windows =


=


Area of 2 doors and 4 windows =


Area of only walls = 301 – 12 = 289 m2


Hence,


Cost of painting walls at rate Rs.3.50 per square metre = Rs.(3.50 ×289) = Rs.1011.50


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