a) 4.16%
b) 5%
c) 6.66%
d) 7%
Answer: c
Explanation:
$$\eqalign{
& {\text{Let the required number of pages be }}x. \cr
& 30 \times 25 \times 35 = x \times 30 \times 28 \cr
& x = 31.25 \approx 32 \cr
& \% \,{\text{increase}}\,{\text{in}}\,{\text{number}}\,{\text{of}}\,{\text{pages}}, \cr
& = {\frac{2}{{30}}} \times 100 \cr
& = 6.66\% \cr} $$
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