I made some fast calculation (a mathematician can find the exact formula) and for example to pay 0.1 safecoin close to 8 decimals (you cannot reach the exact number) you need the following:
A7+A8+A11+A12+A15+A16+A19+A20+A23+A24+A27+A28 = 0.0999999940395355
In each AX, X is the number of division.
In this case you need to generate 56 new safecoin files and you send 12 in the transfer.
In my solution (using decimal division), you generate 10 files, transfer one and send the exact number.