What percentage of 1 hour is 30 minutes?

1. 50

The correct option is A 50
We know that,

If a % of b is c, then $\frac{a}{100}\times b=c$ .

Here, b = 1 hour = 60 mins and
given c = 30 minutes

Then,
$\frac{a}{100}\times 60=30$
$a=\frac{30}{60}\times 100a=\frac{100}{2}a=50$

Therefore, 50 % of 1 hour is 30 minutes.