x% = x/100
So
22.5% = \(\sf{\frac{22.5}{100}}\)
Multiply 2 on both sides:
\(\sf{\frac{22.5\times2}{100\times2}=\frac{45}{200}}\)
Divide by 5 on both sides:
\(\sf{\frac{45\div5}{200\div5}=\frac{9}{40}}\)
So your final answer is \(\boxed{\sf{\frac{9}{40}}}\)
