A key performance indicator (KPI) at Port Sohar is the required time for customs clearance of shipments. The table below shows the average time (in days) for customs clearance for each month between January 2019 to March 2020.

days	month
12.4	June 19
13.0	Feb19
10.9	Mar 19
11.1	April 19
9-3	May 19
8.2	June 19
6.9	July 19
5.3	Aug 19
7.9	Sep 19
8.5	Oct 19
5.6	Nov 19
11.2	Dec 19
10.9	Jan 20
7.4	Feb 20
8.8	Mar 20

For the sake of comparison, all KPIs at Port Sohar are transformed into a point system with 1 point as the worst outcome and 20 points as the best outcome. As a reference for the outcome, the last 12 months are used.

Solve the following problems to calculate the monthly KPI according to Port Sohar's point system.

Calculate the KPI for Nov 2019 with a precision of 2 digits.