i can make you a desktop application for your need in this price range, it will be far better than excel, i can show you some examples if you want, all the calculation and formulas will be in place.
Relevant Skills and Experience
i am a local freelance developer creating desktop software for the local companies in my city, i have great experience in making desktop software, i have been doing this since last two years.
Proposed Milestones
£50 GBP - i will give you screen shots of your software,
£61 GBP - after i give you the full software.
all the formulas calculation will be provided by you,