There were 240 students at a primary school. After some new students were transferred into the school, there were 282 students in all. What was the percentage increase in the number of students at the primary school?

Numbers of students at a primary school before= 240

Number of increased students =42

Again,

Increased number of students in percent(%)= 42/240×100%= 17.5%

Therefore 17.5% students are increased this year.

exactly you go it

step-by-step explanation: