You've been given a network of 130.0.0.0 /16. you need to divide it into four VLSM subnets as follows: Production 500 hosts
Sales 60 hosts
Maintenance 12 hosts
Management 30 hosts

Required:
What will be the last host-usable address in the seattle office?

Hello your required question is wrong as it does not tally with the data provided , attached below is the complete question

/23 /26 /27 /28   option A

Explanation:

Breakdown of the last four subnet masks given to the subnets

For the subnet of 500 production host the mask = /23 which will produce 512 hosts

For the subnet of 60 sales host the mask = /26 which will produce 64 hosts

For the subnet of  12 host the mask = /27 which will produce 32 hosts

For the subnet of 30 hosts the mask = /28 which will produce 16 hosts