Hippogriffs can have black fur or gray fur. However, there is a high rate of mutation from black alleles into gray alleles. In a population of 1000 hippogriffs, if there are 800 alleles for black fur and the forward mutation rate (ie., from black to gray) is 10%, approximately how many black alleles should be expected in the next generation?

A) 720
B) 12
C) 550
D) 60
E) 880