Given the circuit below. R1 is 90Ω, R2 is 112Ω, R3 is 237Ω, and R4 is 129Ω. The potential difference between points a and b is 65V .

Part A
What is the current and potential difference across R1?
Part B
What is the current and potential difference across R2?
Part C
What is the current and potential difference across R3?
Part D
What is the current and potential difference across R4?