Two engineers @ $150k/year for redundancy

  $300k

2x cost multiplier

  $600k

100% markup

  $1200k

16% discount for 5 year contract

  $5000k @ $1000k/year

Plus expenses marked up with overhead and profit in order to travel to their site.

It is not your job to save customers/clients money on your services. Charge enough so it is worth staying in business. That’s what banks want. If you aren’t making a bunch of money, you are a greater risk for theft. Good luck.