The first year, two cows produced 8100 litres of milk. The second year their production increased by 15% and 10% respectively, and the total amount of milk increased to 9100 litres a year. How many litres were milked from each cow each year?	Choose one:
A) 3472
B) 8222
C) 4370
D) 26777
E) 8222
Let x be the amount of milk the first cow produced during the first year. Then the second cow produced (8100−x)(8100−x) litres of milk that year. The second year, each cow produced the same amount of milk as they did the first year plus the increase of 15%15% or 10%10%.   So 8100+15100⋅x+10100⋅(8100−x)=91008100+15100⋅x+10100⋅(8100−x)=9100   Therefore 8100+320x+110(8100−x)=91008100+320x+110(8100−x)=9100   120x=190120x=190   x=3800x=3800   Therefore, the cows produced 3800 and 4300 litres of milk the first year, and 4370 and 4730 litres of milk the second year, respectively.   Answer:4370
<result>C</result>
The first year, two cows produced 8100 litres of milk. The second year their production increased by 15% and 10% respectively, and the total amount of milk increased to 9100 litres a year. How many litres were milked from each cow each year?