Liùyuèfèn de xiāoshòué bǐ shàng yuè zēngzhǎng le bǎifēnzhī shí.
June's sales grew 10% over the previous month.
Tips
grammar
Adding 份 to a month makes it slightly more formal and stresses 'that whole month as a unit/period' — common in news, reports, and statistics. 六月 alone works in everyday talk. Same pattern: 一月份, 二月份, etc., and 年份 (a given year).
