Page 0 of Small Business on Computers and Gadgets

Any examples maybe? Also, other than the payback period, are there any other financial calculations that should be included?
Thanks.
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We sell all kinds of software at very low rates, in fact the lowest anyone can sell them at, but then the problem is, we don’t have enough money to advertise. We have done a bit of sale with some customers (23 to be precise) but still, we are very low on financial status.