$$300\times\frac{3}{10}\times\frac{3}{5}=54$$ 
There are $$300$$ students in Think Primary School. Three-tenths of the students are in year $$5$$ and three-fifths of the year $$5$$ students are girls. How many year $$5$$ girls are there in Think Primary School? 
Options:
a: $$36$$ 
b: $$48$$ 
c: $$54$$ 
d: $$60$$ 
e: $$90$$ 