A bag of toffee is $5$ dollars, a bag of cotton candy is $3$ dollars, and a bag of orange candy is $12$ dollars. Now, the candy shop decides to mix $25$ bags of toffee, $60$ bags of cotton candy, and $15$ bags of orange candy for $100$ bags of assorted candy. What should be the price of the assorted candy in dollars to keep the total revenue unchanged? 
Overseas Competition->Knowledge Point->Word Problem Modules->Average Problems 
Total revenue: $25\times 5+60\times 3+15\times 12=485$ dollars  A bag of assorted candy: $$485\div 100=4.85$$ dollars 