Replying to a Muslim

Question:
Answer:
Fataawah Mahmoodiyah Vol28 pg, 208

Question: If a Muslim greets me, how should I respond to him?

Answer: You should reply to his greeting, with the same greeting or even better. If he says Assalamualaikum, then you could say Wa’alaykumus salaam or Wa’alaykumus salaam warahmatullahi wabarakatuhu.

Fataawah Mahmoodiyah Vol28 pg, 180