Use of $ in postfix expression

Question

1. The value of the postfix expression 8 3 4 + - 3 8 2 / + * 2 $ 3 + is:

   a) 17

   b) 131

   c) 64

   d) 52

2. Prefix of A-B/C*D$E is:

   a)-/*$ACBDE

   b)-ABCD*$DE

   c)-A/B*C*$DE

   d)-A/BC*$DE

Can anybody explain to me how to solve these expressions when a $ sign is present? What does this dollar sign indicate?

Answer 1

In this case, I am certain the operator is exponentiation.

  8 3 4 + - 3 8 2 / + * 2 $ 3 + is:

  8 3 4 + - = 1

  3 8 2 / + = 7

  1 7 * = 7

  7 2 $ = 49

  49 3 + = 52.

Or maybe

  7 2 $ = 128

  128 3 + = 131.

Depends on how your instructor defined the operator.