Question $3[20$ Marks$]$

Consider the following problem to calculate $R$ :

$R=a_4{x}^4+a_3{x}^3+a_2{x}^2+a_{1}x+a_0$

Assume each operation takes $1$ cycle to complete, no communication cost, and each operation can be

executed in a different processor.

How efficient will it be when solving the above proolem using three $(3)$ processols as opposed to one

$(1)$ processor? $($Calculate the efficiency if one is to use $3$ processors$)$