The number of callers that  did not consent to the survey is 40 callers.
Using this formula
Number of caller=CallersĂ—(1-Percentage of those that solicited)Ă·Callers at conclusion survey
Let plug in the formula
Number of caller=400 Ă—(1-20%)Ă·8
Number of caller=400 Ă—80%Ă·8
Number of caller=320Ă·8
Number of caller=40 callers
Therefore the The number of callers that  did not consent to the survey is 40 callers.
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