Compute the 30-, 90-, & 180-day for the British pound

Question

Compute the 30-, 90-, & 180-day forward premium or discount for the British pound in American terms employing the most current quotations.

The formula we desire to employ is:

f_N,_£v$    = [(F_N($/£) - S($/£))/S($/£] x 360/N

f₃₀,_£v$   = [(1.5685 - 1.5683)/1.5683] x 360/30   = .0015

f₉₀,_£v$   = [(1.5694 - 1.5683)/1.5683] x 360/90   = .0028

f₁₈₀,_£v$  = [(1.5714 - 1.5683)/1.5683] x 360/180  = .0040