Answer this question:A secretary who has been working for 6 years and who earns €10,000 a month has obtained a salary increase of 2%. What is her new salary?
We have the amount the salary will increase: 10000 * 2 / 100 = 200€. So the new salary is: 10000 + 200 = 10200€.
The answer is 10200.

Answer this question:John sublets his apartment to 3 people who each pay $400 per month. He rents the apartment for $900 a month. How much profit does he make in a year?
He gets 3 * $400 = $1200 per month. So he gets 1200 * 12 = $14,400 per year. So he pays 12 * 900 = $10800 a year. That means his profit is 14400 - 10800 = $3600 per year.
The answer is 3600.

Answer this question:Mandy is 3 years old. Her brother is 4 times as old as she is. Her sister is 5 years younger than her brother. What is the age difference between Mandy and her sister?
Mandy's brother's age is 3 years x 4 = 12 years old. Her sister's age is 12 years - 5 years = 7 years old. The age difference between Mandy and her sister is 7 years - 3 years = 4 years.
The answer is 4.

Answer this question:Grace can read a 200-page book in 20 hours. How long would it take her to finish reading a 250-page book at this constant rate?
Grace can read 200 / 20 = 10 pages in 1 hour. So she can finish a 250 - page book in 250 / 10 = 25 hours.
The answer is 25.