Hello!
First you have to find how many liters of manure is made a day
1 cow makes 50 liters a day
We can do 50 * 1200 to find how many liters the cows make a day
50 * 1200 = 60000
Then you multiply this my how many days are in a month
60000 * 30 = 1800000
The answer is 1,800,000 liters of manure a month
Hope this helps!