What day of the week would it be on $$30^{th}$$ March 2020?

Counting the years 2000 + 20 = 2020
In 2000 years, there are zero odd days
In 19 years,
There are 4 leap years and 15 normal years, so the odd days are:
4(2) + 15(1) = 8 + 15 = 23,
Which is 3 weeks and 2 odd days

From 1st January to 29th Feb there are 4 odd days
Odd days: January 3, Feb. 1

In 30 days of March, 2020 there are 4 weeks and 2 odd days
Total odd days = 0 + 2 + 4 + 2, 8 odd days i.e 1 week and 1 day, so it is a Monday.

Option C is correct.