(b) 0.06
\(\frac{489.1375 \times0.0483\times1.956}{0.0873\times92.581\times 99.749}\) = \(\frac{489\times0.05\times2}{0.09\times93\times100}\)
= \(\frac{489}{9\times93\times10}\) = \(\frac{163}{279}\times\frac1{10}\) = \(\frac{0.58}{10}\) = 0.058 = 0.06.