Consider the following statements:

1. For a given base kV and base MVA, the per-unit impedance value of an element is 'Z'. ] the per-unit impedance value of this element will be Z/2  when the base kV and base MVA are both doubled

2. An equipment has a per unit current of 0.05 on a base of 40 A. If the base current has been changed to 10 A then 1 A new per unit value of the equipment 

3. Per unit system is the ratio of actual value to base value

Which of the following statement(s) is/are correct?