Solution (By Examveda Team)
$$\eqalign{
& = \frac{{3.157 \times 4126 \times 3.198}}{{63.972 \times 2835.121}} \cr
& \approx \frac{{3.2 \times 4126 \times 3.2}}{{64 \times 2835}} \cr
& = \frac{{32 \times 4126 \times 32}}{{64 \times 2835}} \times \frac{1}{{100}} \cr
& = \frac{{66016}}{{2835}} \times \frac{1}{{100}} \cr
& = \frac{{23.28}}{{100}} \cr
& = 0.23 \cr
& \approx 0.2 \cr} $$
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