Assuming the same initial values for the dollar/pound cross rate in the FX Option Pricing workbook, how much more would a call option on pounds be if the maturity was doubled from 90 to 180 days? What percentage increase is this for twice the length of maturity?

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Pricing Currency Options on the Euro A U.S.-based firm wishing to buy or sell euros (the foreign currency) A European firm wishing to buy or sell dollars (the foreign currency) Variable Variable Value $1.2480 $1.2500 1.453% 2.1 87% alue Spot rate (domestic/toreign) Strike rate (domestic/toreign) Domestic interest rate (% pa) Foreign interest rate (% pa) Time (years, 365 days) 0.8013 21 87% 1.453% 1.000 365.00 1.000 365.00 10.500% $0.0461 $0.0570 Volatility (% pa) Call option premium (per unit fc) 0.0366 0.0295 European pricing) Call option premium (%) 456% 4.57% 3.68%