[tex] \frac{1}{10*11} + \frac{1}{11*12}+....+ \frac{1}{99*100} > 0.08 \\ \\ \frac{1}{10} - \frac{1}{11} + \frac{1}{11} - \frac{1}{12} +.....+ \frac{1}{99} - \frac{1}{100} > 0.08 \\ \\ \frac{1}{10} - \frac{1}{100} >0.08 \\ \\ \frac{10}{100} - \frac{1}{100} > 0.08 \\ \\ \frac{9}{100} >0.08 \\ \\ 0.09>0.08[/tex]