A processor asks for the contents of the virtual memory

A processor asks for the contents of the virtual memory address 0x30020. The Paging scheme in use breaks this into a VPN of 0x30 and an offset of 0x020. PTB a CPU register that holds the address of the page table) has a value of 0x100 indicating that This process’s page table starts at location 0x100. The machine uses word addressing and the page table entries are each one word long. 

PTBR = 0x100 

VPN Offset 

0x30 0x020 

The contents of selected memory locations are: 

a. What is the physical address calculated? 

b. What are the contents of this address returned to the processor? 

c. How many memory references would be required (worst case)?