Least common multiple of 50 and 55 is

The correct option is C 550
Prime factors of 50 = $2\times 5\times 5$
Prime factors of 55 = $5\times 11$
$\Rightarrow$ Least common multiple or least number divisible by both 50 and 55 = $2\times 5\times 5\times 11$ = 550