(1/(Log[2]))Quantity[{{321,1},{31.4,0.2},{32.6,0.2}},"Microseconds"]//N

{R,ΔR}=Transpose[{{1,0.05},{10,0.5},{1,0.05}}]

{CC,ΔC}=Transpose[{{470,47},{4.7,0.47},{47,4.7}}]

Table[With[{r=R[[i]],c=CC[[i]],Δr=ΔR[[i]],Δc=ΔC[[i]]},{r*c,Sqrt[(((Δr*c))^2)+(((Δc*r))^2)]}],{i,1,3}]