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It all depends on what kind of circuit you are monitoring.
It it is a half duplex circuit, then you are correct in your calculations.
If it is capable of full duplex, then there are 2 ways of calculating this.
If you are a Network Sales person you would just double the half duplex bandwidth;
i.e. tell your customers their 100mbps FDX switch port is actually a 200Mbps port
(in fact certain switches use this figure when you discover the port with SNMP).
In real world terms you would add the in & out percentages and divide by two for a full
duplex circuit. The percentages shown by NPM are for one direction only assuming the
bandwidth statement applies to each direction (you can adjust these for asynchronous circuits).