Please explain your answer by showing how it was worked out. I already have the answer. I want to see the work.

3) What is the decimal equivalent of 01000110001000 in the simple model (1 bit sign, 5-bit excess-15 exponent, 8-bit normalized significand)?

a) 2.125

b) 1.0625

c) 4.25

d) 8.5