What is the perimeter of a right-angled triangle whose sides (making $$90^\circ$$) are $$20 \sqrt{3}$$ cm and $$15 \sqrt{3}$$ cm?

A

$$60 \sqrt{3}$$ cm

B

$$55 \sqrt{3}$$ cm

C

$$65 \sqrt{3}$$ cm

D

$$50 \sqrt{3}$$ cm