わり

In a sentence

• 彼の成功は、努力の割合が大きい。

  His success largely depends on his effort.

  Here, '割合' (wariai) is used to refer to a proportion or ratio, indicating the significant part effort has in his success.

• この商品は割引されているので、お得ですよ。

  This item is discounted, so it's a great deal.

  In this case, '割' (wari) is part of '割引' (waribiki), meaning discount, referring to a reduction in price.

• 彼に会いに行ったのだが、わりに元気そうだった。

  Although I went to visit him, he seemed quite healthy.

  'わりに' (wari ni) suggests a relatively unexpected result compared to what was assumed.