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x=segundo dia
2
x=tercer dia
4
o lo que es lo mismo:
4x=primer dia
2x=segundo dia
x=tercer dia
entonces:
x+2x+4x=420000
7x=420000
x=420000
7
x=60000
entonces:
segundo dia..............2x........2(60000)=120000
el segundo dia gano $ 120,000