If cost of $1kg$ apple is ₹300, then the cost of $\frac{1}{2}kg$ of apple is ___.

The correct option is C ₹150
cost of $1kg$ apple $=₹300$

$\frac{1}{2}kg$ of apple $=\frac{300}{2}$

$=₹150$

$\therefore$ cost of $\frac{1}{2}kg$ cake is ₹150.