Can you please help me rewrite my email I am sending to make it professional.

” Dear Sam,

I hope everything going well. We have worked on the feasibility study and added and changed few things so it fits the rules and regulations of the kingdom. Also, we had to increase the price a little bit up to make it feasible. we have couple of questions:-

1. what do you mean about ”interest on – ve cash flow % p.a”?

2. is the consumable kit the only thing we need to run the machines?

3. Can we do any customization to the machine software? For example, changing the sizes of the photo ID or adding a feature for new type of photo ID? “