Was I overcharged for the prorated payment I submitted upon obtaining a reserved parking space?

Until recently, my rent was $849.91 a month ($777.05 for apartment and $72.86 for regular parking in garage). On November 25th, I made it to the top of the waiting list for a reserved space, making my rent now $873.89 a month ($23.98 more), as reserved parking is $96.84. But the prorated amount I paid for those six days in November was for $29.48.