I resolve it after 2 minutes........for this particular problem is good (on average) or is too long ??
what is your thought ???
Since this problem has quite confusing wording and after you get through it you should calculate approximate value of 0.20*1,560,000-0.14*495,000=~0.20*1,600,000-0.15*500,000=320,000-75,000=245,000 then I'd say that 2 minutes is not that long, after all.