values are in millions$)$:

The system life of $8$ years represents the period that the contract with the medical suppliers is in force. The hospital's MARR is $10\%,$

a$)$ What is the incremental rate of return going from the current practice to the just in time system?

IRR for $($Just in time $-$ Current practice$)=$

b$)$ What is the incremental rate of return going from the just in time system to the stockless supply system?

IRR for $($Stockless supply $-$ Just in time$)=$

$($keep $2$ decimal places in numerical results$)$

c$)$ What is the incremental rate of return going from the current practice to the stockless supply system?

IRR for $($Stockless supply $-$ Current practice$)=$

$\%$

d$)$ Based on the above calculated numbers, which option is the best by utilizing the incremental rate of return criterion?