For a given circuit below, determine the current (i₁) and (vₛ) respectively. (Hint: use current divider rule and then determine the voltages (vᵣ₁) and (vᵣ₂) to determine (vₛ)).
a) (i₁ = 2A, vₛ = 20V)
b) (i₁ = 2A, vₛ = 28V)
c) (i₁ = 6A, vₛ = 20V)
d) (i₁ = 6A, vₛ = 28V)