How to calculate size of PC, MAR, MDR, IR for 32-bit microprocessor with 24-bit address and 32-bit data bus?

Stuck in this question for a long time 

For a 32 bit microprocessor with a 24-bit address bus and 32-bit data bus what will be the size(in bits) of the Program Counter(PC), MAR(Memory Address Register), MDR(Memory Data Register), IR(Instruction Register), Accumulator 

Kindly let me know the solution if anyone knows how to solve.

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