Calculating Post 9/11 GI Bill Benefit Months

So I'm filling out my application for Post 9/11 and haven't found a clear answer on how to calculate my benefit months. I know that Post 9/11 eligible veterans receive 12 months of Post 9/11 once they exhaust their Montgomery GI Bill for a total of 48 months of benefits.

In my situation, I am a reserve component soldier who used about 16 months of CH 1606 (Reserve Component GI Bill) prior to obtaining Post 9/11 eligibility, leaving me with about 20 benefit months remaining. I'm assuming that when receiving Post 9/11 they'll do 48-16 = 32 months of Post 9/11?