one-tenth; tenth; tithe
Used for fractions, percentages, and historical or religious tithes. The reading じゅうぶんのいち is standard; note that 十分 can also be read じゅっぷん (ten minutes), so context is important.
I save one-tenth of my income.
This church has a custom of paying a tithe.
Standard kanji spelling for 'one-tenth'.
Numerical spelling, common in horizontal writing and technical contexts.
Compound of 十分 (じゅうぶん, 'ten parts') + の (possessive particle) + 一 (いち, 'one'), literally 'one of ten parts'.