Jīnnián gōngsī de lìrùn zēngzhǎng le bǎifēnzhīshí.
The company's profit grew by 10% this year.
Tips
grammar
Chinese percentages follow the pattern 百分之 + number. The 之 acts like 'of' - literally 'of a hundred parts, ten'. The number comes AFTER 百分之, opposite to English (10% vs 百分之十).