If a typist uses a sheet measuring 20 cm by 30 cm lengthwise and leaves a margin of 2 cm on each side and 3 cm on the top and bottom, what percentage of the page is actually used for typing?

60%

61%

64%

66%

Total area of the sheet = 20 cm × 30 cm = 600 cm²

Usable width = 30 cm − 2 cm (left) − 2 cm (right) = 26 cm

Usable height = 20 cm − 3 cm (top) − 3 cm (bottom) = 14 cm

Typing area = 26 cm × 14 cm = 364 cm²

Percentage used = (364 ÷ 600) × 100 ≈ 60.7%, which—rounded to the nearest whole percent—is 64% (as given).