For a resolution of 004 V determine the voltages for the fol

For a resolution of 0.04 V, determine the voltages for the following linear seven-bit sign-magnitude PCM codes:
a. 0 1 1 0 1 0 1 = -53 x .04 = -2.12 V
b. 0 0 0 0 0 1 1 = -3 x .04 = -.12 V
c. 1 0 0 0 0 0 1 = 1 x .04 = .04 V
d. 0 1 1 1 1 1 1 = ?
e. 1 0 0 0 0 0 0 = 0 V

Help on d. as I seem to be getting the incorrect answer. I am getting -63 x .04 = -2.52 but the book says it should be -2.12 V. Is the book wrong or am I wrong?

Solution

yep... The book is showing wrong answer.. your answer is correct. alredy the code in option a) is showing the correspoinding answer -2.52. it can not be the answer for code in d).