Black Friday: lifetime access is on a special offer in the app, until November 30. Black Friday: special offer on lifetime access, until November 30. Download
단일세는 모든 소득에 대해 동일한 세율을 적용합니다.danilseun modeun sodeuge daehae dongilhan se-yul-eul jeog-yonghamnida.The single tax applies the same tax rate to all income.