(Solved): Due to build up of fatty tissue inside a blood vessel, the internal radius decreased by \( 8.5 \% ...

Due to build up of fatty tissue inside a blood vessel, the internal radius decreased by \( 8.5 \% \). Assume that the pressure difference does not change. What should be the ratio of the new viscosity to that of the old viscosity of blood so that the volume flow rate through the vessel stays the same?