Develop an Accounting Software(repost)

I am an IT Consultant based in Singapore. For the past 6 years I helped about 40 small wholesalers and retailers to computerize their operations. I implemented packaged accounting and point-of-sale software from MYOB Australia ([login to view URL]). I have several clients (wholesalers), who are currently using MYOB Premier accounting software. Some of these clients issue more than 30 invoices a day. However, MYOB Premier is unable to handle the load because it does not use an SQL database. Its response time is getting slower and slower as the database grows. Response time also decreases if there is more than 1 simultaneous user. MYOB Premier is also not client/server so sometimes users get locked out. MYOB was developed about 15 years ago and uses a proprietary database. However it is ODBC compliant. You can download a trial version of MYOB Premier v12 from [login to view URL] It is a full working software. My clients asked me to develop a simple Accounting Software similar to MYOB Premier but with some additional features which MYOB does not have. I want to outsource the development to a software company in India.? Attached are menus, screens list and database. There are about 100 unique screens. I have written detailed specifications for all the screens. I will provide forms and reports formats later. I WILL NOT provide the logic. The developer must know how accounting software works and write code accordingly. If you are interested in this project please give me an estimate of cost and time.