What is the interest on $250 at 3% for 30 years

You deposit $250 into a bank account paying 3% simple interest per year. You left the money in for 30 years. Find the interest earned and the amount at the end of those 30 years, The interest is $225 and the amount is $475 that is the answer.

I'll solve the question, but I need the number of people who came to the concert

(edited)

Depending on the number of people that attended the concert, multiply that number by 0.40. After you get that number, add it to the original number of people, that would be your answer.

Example: 10 people attended the concert. You would multiply 10 by 0.40, which is 4. Add 4 to the number original number of people attending the concert, which was 10. Your final answer would be 14 people attended the drama play.