Question

A typist uses a paper 30cm by 15cm. He leaves a
margin of 2.5 cm at the top as well as at the
bottom and 1.254 cm on either side. What
percentage of paper area is approximately
available for typing?
1.65%
2. 70%
3. 80%
4. 60%​

Answer 1

Answer:

Area of the sheet = (30 × 15) cm2 = 450 cm2

Area used for typing

= [(30 - 5) × (15 - 2.5)] cm2

= 312.5 cm2

∴ Required percentage :

=(312.5450×100)%=69.4%≈70%

Answer 2

$\huge† \huge \bold{\: \pmb {\red{ Answer }} }$

$\sf \: Area \: of \: the \: sheet \: = (30 × 15) {cm}^{2} \\ \\ \sf = 450 \: {cm}^{2}$

$\sf \: Area \: used \: for \: typing \\ \\ \sf \: = [(30 - 5) × (15 - 2.5)] {cm}^{2} \\ \\ \sf \: = 312.5 \: {cm}^{2}$

• ∴ Required percentage :

$\sf \: = \frac{312.5}{450}×100\% \\ \\ \sf \: =69.4\%≈70\%$

Option 2. 70% is correct answer.