Let, width of the rectangle be x meter
Length of the rectangle be 3x meter
According to question,
3x×x=1,200⇒3x2=1,200⇒x2=
The perimeter of rectangle will be meter
Perimeter of the square, 4a=160
One side of the square will be 40 meter
Area of the square will be = (40 x 40) = 1,600m2
Now, length of 1 stone is 50cm =
Area of one stone will be =
Number of stone required to cover the square = 1,600+0.25=6,400 pieces
Total amount of taka required at 50 tk per stone is Tk. ans.