$4\mathrm{.}36$ Suppose the pound devalues from $$1\mathrm{.}25$ at the start of the year to $$1\mathrm{.}00$ at the end of the year. Inflation during the year is $15\%$ in England and $5\%$ in the U$.$S$.$ What is the real devaluation $(-)$ or real revaluation $(+)$ of the pound during the year?

a$)-12\mathrm{.}38\%$

b$)-20\mathrm{.}71\%$

c$)+2\mathrm{.}39\%$

d$)+1\mathrm{.}46\%$