excel for accounting help. can you tell me step by step of what to do. thank you

Warhawk Company is planning to spend up to $400,000 on new machines. Warhawk has decided to purchase two different models of machines and are trying to decide how many of each model to purchase. The two models are C100 and E750. The C100 costs $22,000 each and the E750 costs $35,000 each. The E750 has some extra features so at least one-third of the total machines purchased must be the E750. Warhawk's annual maintenance budget for the new machines is $12,000. The annual maintenance costs for each C100 is $750. The annual maintenance costs for each E750 is $1,200. Each C100 machine can produce 8.100 units per year. Each E750 machine can produce 12,500 units per year. Requirements: 1. Use solver to determine how many of each machine should be purchased in order to maximize annual production while meeting all of the constraints