Correct option is C
We put @ = +, and $ = -
23 @ 47 $ 22 = 48
LHS = 23 + 47 – 22
= 70 – 22
= 48 RHS.
34 @ 18 $ 13 = 39
LHS = 34 + 18 - 13
= 52 – 13
= 39
Similarly,
12 @ 43 $ 14
= 12 + 43 – 14
= 41