Hello dear sir/mam,
I have gone through your project requirement. I understand your requirement so that why I would like to build your calculator plugin in your design with your consultant. I can make my best design in your work. I can provide you, my previous work and portfolio's, so chat with me. My project price will be negotiable. I'm working 24*7. So please chat with me, If you did't like my work, than don't chat with me. My promise to you that definitely you will like my work.
If you want to work with me, you have to heir me as a best designer. I'm a fully professional designer (since - 2006)..
thank you, have a nice day ahead.