The resistance of a galvanometer is high or low and why?

The resistance of a galvanometer is R ohms and its maximum reading is I ampere. A shunt is connected across the galvanometer so that it is made an ammeter that can read NI ampere (N>1) The value of the shunt (Sh) in ohms is

The current through a Galvanometer reduces to 20% of its original value when a shunt is connected. The resistance of the galvanometer coil is 100 Ohm. Then the value of the shunt in Ohms is

The deflection of a galvanometer falls to 20 divisions from 50 divisions when a resistance coil of 12 ohm is connected across the galvanometer coil. The resistance of the galvanometer coil in ohms is