Two reservoirs having a difference of $10 \mathrm{~m}$ in their water surface elevations are connected by a pipeline (diameter $=10 \mathrm{~cm}$, length $=50 \mathrm{~m}$, and friction factor $f=0.02$ ). If the last $25 \mathrm{~m}$ length of the pipeline is replaced by a same material pipe of diameter $20 \mathrm{~cm}$ then neglecting minor losses the discharge (in \%, rounded off to one decimal place) will increase by____________
