GK 2020 Q12
12. Werner’s salary is 20% of his boss’s salary. By what percentage is his boss’s salary larger than Werner’s salary?
- A 80%
- B 120%
- C 180%
- D 400%
- E 520%
Grey Kangaroo 2020, Question 12. © UK Mathematics Trust. Original paper on ukmt.org.uk
Answer: D 400%
Werner’s salary is 20% of his boss’s salary. Therefore his boss’s salary is \(\tfrac{100}{20} = 5\) times Werner’s salary. Hence his boss’s salary is 500% of Werner’s salary and so is 400% larger.
Solution © UK Mathematics Trust, from the GK 2020 solutions.