Final answer:
The municipal finance professional may contribute an additional $50 to the mayor's reelection campaign without affecting the firm's municipal securities business, staying within the $250 per-election limit set by the MSRB's Rule G-37.
Step-by-step explanation:
The question pertains to the rules regulating campaign contributions as they relate to a FINRA broker-dealer and municipal securities offerings. Under FINRA rules, specifically Rule G-37 of the Municipal Securities Rulemaking Board (MSRB), a municipal finance professional may contribute up to $250 per election to any candidate for whom the individual is entitled to vote and not be subject to a ban on municipal securities business. Given that the municipal finance professional has already contributed $200 to the mayor's reelection campaign 13 months ago, the additional amount the employee is allowed to contribute without impacting the municipal securities business of the firm is $50, which is the difference between the original contribution and the $250 per election limit.