MBPF Bank on the average receives $20$ loan applications per hour. Each loan application goes through an initial processing stage, where an "accept" or "reject" decision is made. Approximately $80\%$ of the loans are accepted. Accepted loans require additional processing. Rejected loans require no additional processing. Suppose that on the average $5$ loans applications are in the initial processing stage, and $25$ accepted loan applications are in an additional processing stage.

$1.$ What is the average processing time required for a rejected loan?

The potential answers are:

A: $18$ minutes.

B: $16\mathrm{.}8$ minutes.

C: $14\mathrm{.}55$ minutes.

D: $13\mathrm{.}5$ minutes.

E: $15$ minutes.