What decimal value does the $8-$bit binary number $10011110$ have if:

a$)$ It is interpreted as an unsigned number?

b$)$ It is on a computer using signed$-$magnitude representation?

c$)$ It is on a computer using one$$s complement representation?

d$)$ It is on a computer using two$$s complement representation?

e$)$ It is on a computer using excess$-127$ representation?