A baby otter was born 3/4 month early. At birth, its weight was 7/8 of a kilogram, which is 9/10 less than the newborn otter in the aquarium. What is the average weight of a newborn otter?
a) 1.4 kilograms
b) 1.6 kilograms
c) 1.8 kilograms
d) 2.0 kilograms