Răspuns :
Deci in prima luna 2180..in a 2-a 2180-894 deci a vandut 1286...in a 3-a a vandut 2180+1286..deci a vandut 3466
2180-894=1286 a doua lună
a treia lună:2180+1286=3466
2180+(2180-894)=2180+1286=3466
a treia lună:2180+1286=3466
2180+(2180-894)=2180+1286=3466