Please show how to get the calculations for Part B and D. I have completed the problem but I feel like my answer is wrong

Part A and C have been intentionally omitted bc Chegg Experts have a difficult time following directions on which problem I need help with

2. Given the following currency exchange rates: Time period 1: C$0.95/S$ Time period 2: C$0.75/S$ b. Calculate the % change of the value of C$ from time period 1 to time period 2. You need to show the calculation in order to receive full credit. d. Calculate the % change of the value of S$ from time period 1 to time period 2. You need to show the calculation in order to receive full credit