??????????? "php" ???? thats a programming lingo
me thank yu tri tu sae...sumwon get INTEREST on 1,000,000$
sum at 8% & sum at 12%
& interest=180,000$/yeer
0.08*x +0.12*(1,000,000-x)=180,000
0.08x -0.12x +120,000=180,000
-0.04x=180,000-120,000=60,000
x=60,000/(-0.04)
=-15,000,000
sumwon make munee outa nuthun
thats bekauz 12% *1,000,000$=120,000$
but yu klaem sumwon get 180,000$ in interest