Between 1960 and 1990, the number of farms in the United States decreased by 2.1% per year. In 1960, there were 4 million farms. How many farms were there in 1990?​

Fifty students are trying to raise at least 12,500 for a class trip. they have already raised 1,250. how much should each student raise on average in order to meet the goal? write and solve the two step inequality for this problem