$B=\frac{3}{4}.$ $\frac{8}{9}...$ $\frac{9999}{100000}$ =>$B=$$\frac{3}{2.2}.$ $\frac{2.4}{3.3}...$ $\frac{99.101}{100}$ =>$B=$ $\frac{2.3...99}{2.3...100}.$ $\frac{3.4...101}{2.3...100}$ =>$B=$ $\frac{1}{100}.$ $\frac{101}{2}$ =>$B=$ $\frac{101}{200}$