Final answer:
The cost change of a train ticket from Bath to Birmingham in May cannot be determined from the information given.
Step-by-step explanation:
The subject of this question is Mathematics. The question is asking about the change in the cost of a train ticket from Bath to Birmingham in May. To determine the answer, we need to consider the options given: a) Increased by 20%, b) Decreased by 15%, c) Remained the same, or d) Cannot be determined from the information given.
To find the correct option, we need information about the actual cost of the ticket in May. If we have the initial cost, we can calculate whether it increased, decreased, or remained the same based on the given percentages. Without the initial cost or any additional information, we cannot determine the answer and the correct choice would be d) Cannot be determined from the information given.