Please answer and show work thx

When a charge of -4 x 10" coulomb is moved between two points in an electric field, 0.8 joule of work is done on the charge. Calculate the potential difference between the two points. Calculate the work done on an elementary charge that is moved between two points in an electric field with a potential difference of 1 volt. A charge, equal to 2 x 10' elementary charges, is moved through a potential difference of 3000 volts