Area to be plastered= [2(l + b) x h] + (l x b)
= [2(25 + 12) x 6] + (25 x 12)
= (444 + 300)
= 744
Cost of plastering = Rs. 744 x (75/100)= Rs. 558
Let original radius = R.
New radius = =
Original area = and new area =
Decrease in area = = 75%
A=lb
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