$16*13 days/30 = approx. $6.93 or $7 till October 31st, 1966
Therefore, the monthly amounts will be as such:
October 7th – November 7th = $30
November 7th – December 7th = $39
December 7th – January 7th, 2020 = $39
New total of = $108.4 (or $108 after rounding) ending January 7th, 1966