\"\"

\

The inequality is  \"\".

\

\"\"                   (Rewrite \"\")

\

\"\"                 (Apply power of power property: \"\")

\

Apply Property of equality for exponential functions: \"\".

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\"\"

\

\"\" (Subtract 20p from each side)

\

\"\"

\

\"\"

\

\"\"               (Subtract 10 from each side)

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\"\"

\

\"\"                             (Divide each side by 5)

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\"\"

\

\

\"\"

\

CHECK:-

\

To check the solution, substitute \"\" in \"\".

\

\"\"

\

\"\"              (Rewrite \"\")

\

\"\"                       (Apply power of power property: \"\")

\

The inequality is  true.\"\"

\

The solution is \"\".