- A4 : 5, an increase of 25%
- B4 : 5, an increase of 20%
- C5 : 4, an increase of 125%
- D4 : 5, an increase of 12%
Step-by-Step Solution
. The increase is 1 part on a base of 4 parts: . Dividing by 5 (the new value) gives the wrong 20%; 12% is just .
Answer: A) 4 : 5, an increase of 25%