Step 1

Please find below

6-1) \(\displaystyle{0.88}={\frac{{{88}}}{{{100}}}}={88}\%\)

6-7) it is already in percentage

Step 2

6-13) \(\displaystyle{\frac{{{1}}}{{{12}}}}={0.0833}=\frac{{83.33}}{{100}}={83.33}\%\)

6-17) \(\displaystyle{4}\%={\frac{{{4}}}{{{100}}}}={0.04}\)

6-23) 7% of \(\displaystyle{150}={\frac{{{7}}}{{{100}}}}\times{150}={\frac{{{21}}}{{{2}}}}={10.5}\)

6-27) 17.4% of \(\displaystyle{900}={\frac{{{17.4}}}{{{100}}}}\times{900}={17.4}\times{9}={156.6}\)

Please find below

6-1) \(\displaystyle{0.88}={\frac{{{88}}}{{{100}}}}={88}\%\)

6-7) it is already in percentage

Step 2

6-13) \(\displaystyle{\frac{{{1}}}{{{12}}}}={0.0833}=\frac{{83.33}}{{100}}={83.33}\%\)

6-17) \(\displaystyle{4}\%={\frac{{{4}}}{{{100}}}}={0.04}\)

6-23) 7% of \(\displaystyle{150}={\frac{{{7}}}{{{100}}}}\times{150}={\frac{{{21}}}{{{2}}}}={10.5}\)

6-27) 17.4% of \(\displaystyle{900}={\frac{{{17.4}}}{{{100}}}}\times{900}={17.4}\times{9}={156.6}\)