Sentence examples for thirty percent from inspiring English sources

The phrase 'thirty percent' is correct and commonly used in written English.
It can be used to express a percentage or proportion of something. For example: "Thirty percent of the students in the class received an A on the test." In this sentence, 'thirty percent' is used to convey the percentage of students who received an A. Another example: "The company's profits increased by thirty percent compared to last year." Here, 'thirty percent' is used to indicate the proportion of profit growth from the previous year.