Suppose that average tuition grows at a constant rate. Suppose the cost was $7,000 in 1990 and $14,000 in 2010. Select all the correct statements: (a) Average tuition will be approximately four times higher in 2030 than in 2010. (b) Average tuition will be approximately $21,000 in 2030. (c) Average tuition will be approximately $56,000 in 2050. (d) Average tuition is growing at exactly 3.0 percent per year. (e) Average tuition will be approximately four times as high in 2030 as in 1990.