The shaded part in taking 2 grids together represent
67.5
Total shaded part in 2 grids = 100 squares of first grid + 15 square of second grid.
Total squares in two grids = 100 + 100 = 200
Fraction =100+15200=115200=67.5100=67.5%
Hence, the shaded part taking 2 grids together represent 67.5%.