JEE Advanced 2018 Physics question

A steel wire of diameter 0.5 and Young's modulus carries a load of mass . The length of the wire with the load is 1.0 . A vernier scale with 10 divisions is attached to the end of this wire. Next to the steel wire is a reference wire to which a main scale, of least count 1.0 , is attached. The 10 divisions of the vernier scale correspond to 9 divisions of the main scale. Initially, the zero of vernier scale coincides with the zero of main scale. If the load on the steel wire is increased by 1.2 , the vernier scale division which coincides with a main scale division is . Take and .