Alternative RNA Splicing?

In liver cells, a gene 1440 DNA base pairs long codes for an enzyme composed of 192 amino acids. Discuss this apparent Discrepancy, while keeping in mind that there are about 8 Introns in the average gene and each Intron is between 20 and 200 nucleotides. How long would the initial and final mRNA transcript be (pre mRNA length vs. Mature mRNA length)?