Coding and Decoding Questions

In a certain code language, '+' represents 'x', '-' represents '+', 'x' represents '÷' and '÷' represents '-'. What is the answer to the following question?
550 x 22 - 24 + 3 = ?

If x means +, + means ÷, − means x and ÷ means −, then 8x7−8+40÷2 = ?

If 11$25 = 18, 12$20 = 16 then what is the value of 4$50 = ?

If 40@8 = -5, 30@3 = -10 and 20@5 = -4, then find the value of 60@3 = ?

If 13 # 9 = 94 and 18 # 7 = 100, then 24 # 6 = ?

In a certain code language, '-' represents '+', '+' represents 'x', 'x' represents '÷' and '÷' represents '-'. Find out the answer to the following question.

9 - 18 + 35 x 10 ÷ 30 = ?

If "S" denotes "multiplied by", "V" denotes "subtracted from", "M"denotes "added to" and "L" denotes "divided by", then

96 L 12 S 7 V 49 M 10 =?

If SUN = 108, MOON = 114. What is STAR = ?