Question
What per cent of $1h$ is $30$ min$?$
✓
Answer
Let $x\%$ of $1h\ 30\min.$
Then, $\frac{\text{x}}{100}\times1\text{h}=30\text{min} [ \therefore 1h = 60\min.]$
$\Rightarrow\frac{\text{x}}{100}\times60\text{min}=30\text{min}$
$\Rightarrow\text{x}=\frac{30\times100}{60}$
$\therefore\text{x}=50\%$
Hence, $50\%$ of $1h$ is $30\min.$
Then, $\frac{\text{x}}{100}\times1\text{h}=30\text{min} [ \therefore 1h = 60\min.]$
$\Rightarrow\frac{\text{x}}{100}\times60\text{min}=30\text{min}$
$\Rightarrow\text{x}=\frac{30\times100}{60}$
$\therefore\text{x}=50\%$
Hence, $50\%$ of $1h$ is $30\min.$
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