倍額

1. Origins, structure, and basic meaning

• Structure: 倍額 is read as ばいがく and means an amount equal to twice a reference amount.
• Basic usage: It is used when one fare is set at twice another or when an actual repair cost becomes twice its estimate.

2. Common pitfalls and similar expressions

• Compared with a reference amount
  • 普通席の倍額 means that the special-seat fare is exactly twice the regular-seat fare. Example: 特別席の料金は普通席の倍額に設定されている。
• The result of becoming double
  • 見積もりの倍額になる means the repair cost became twice the estimate, not merely that it increased. Example: 修理費が見積もりの倍額になり、計画を見直した。