In a certain code language, '$$+$$' represents '$$-$$', '$$-$$' represents '$$\times$$', '$$\times$$' represents '$$\div$$' and '$$\div$$' represents '$$+$$'. Find out the answer to the following question.
$$90 \times 10 \div 25 - 5 + 50 = ?$$

A

81

B

84

C

100

D

48