A new type of tulip is produced that develops only purple or pink flowers. Assume that flower color is controlled by a single gene locus, and that the purple allele (C) is dominant to the pink allele (c). A random sample of 1000 tulips from a large cultivated field yields 847 purple flowers and 153 pink flowers. A gene test determines that 243 of the purple flowers are CC and 604 of the purple flowers are Cc. What is the allele frequency of C in this population?