半額

1. Origins, structure, and basic meaning

• Structure: 半額 (はんがく) is a compound noun for half the original price or a state of fifty-percent discount.
• Basic usage: 弁当が半額になった describes a meal price reduced before closing, while 入場料が半額になる describes a coupon cutting an admission fee in half.

2. Common pitfalls and similar expressions

• Product markdown and fee reduction
  • 半額になる is a price change in both examples, not a reduction in item quantity. The expression presupposes an original price as its baseline.