Assume the cost of a fractional T1 (FT1) line operating at 384 kbps between New York and Chicago is $$\$ 2100$$ per month. If the use of 64 kbps ISDN costs 10 cents/minute, how many minutes per month can you operate a 384 kbps videoconference between locations prior to exceeding the cost of the FT1 line? (For the problem, do not consider the cost of inverse multiplexers.)