If '$$+$$' means '$$-' , '-$$' means '$$\times' , '\times$$' means '$$\div$$' and '$$\div$$' means '$$+$$', then what will come in
place of (?) in the given equation?
$$30 + 5 - 2 \times 10 \div 2 = ?$$

A

50

B

31

C

80

D

60