10x+ 10y=350
30x+20y=850，
Solution: X= 15, Y=20.
According to the data 1, you have to work 440 minutes a day and 1 1000 minutes a month.
According to the second information: suppose the quantity of product A is 60 pieces, 15*60+x (product B) *20= 1 1000,
Then produce product B:505 pieces,
The smallest one gets at most: 60 *1.5+505 * 2.8 =1666 yuan.