Which of the following is not a notion of opposites? 

Represent the following by an integer. 

Earning $₹15,000$    $\boxed{ }$

Represent the following by an integer. 

Depth of $85 \mathrm{m}$      $\boxed{ }$

Represent the following by an integer.

$9$ step forward 

Represent the following by an integer. (without $₹$ symbol)

Gain of $₹700$