Usable typing area with margins: A sheet is 20 cm × 30 cm (used lengthwise). Margins: 2 cm on each left/right side and 3 cm on top/bottom. What percentage of the page area is usable for typing?

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Solve this multiple-choice question and choose the correct option.

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Introduction / Context:Page layout questions ask you to subtract margins from the total dimensions to find the printable/typing area, then express it as a percent of the full page area. Given Data / Assumptions: Total page: 20 cm × 30 cm. Margins: 2 cm each side (left and right), 3 cm top and bottom. “Lengthwise” orientation does not change the arithmetic; it simply clarifies which side is treated as vertical. Concept / Approach:Usable width = total width − (left + right). Usable height = total height − (top + bottom). Usable area divided by total area × 100 gives the desired percentage. Step-by-Step Solution: Total area = 20 × 30 = 600 cm^2.Usable width = 20 − 2 − 2 = 16 cm.Usable height = 30 − 3 − 3 = 24 cm.Usable area = 16 × 24 = 384 cm^2.Percentage used = (384 / 600) × 100% = 64%. Verification / Alternative check: Quick ratio check: 16/20 = 0.8 and 24/30 = 0.8 ⇒ area factor 0.8 * 0.8 = 0.64 = 64%. Why Other Options Are Wrong: 74%, 84%, and 94% would require different margin sizes or arithmetic; none match the correct 0.64 factor. Common Pitfalls: Subtracting margins only once instead of both sides (left and right; top and bottom). Final Answer: 64%

Usable typing area with margins: A sheet is 20 cm × 30 cm (used lengthwise). Margins: 2 cm on each left/right side and 3 cm on top/bottom. What percentage of the page area is usable for typing?

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