1. Yesterday Mary Lou worked a full shift of M hours and an additional N hours of overtime. She re-
ceived 150% of her usual hourly rate for the overtime hours. Given that M and N are positive integers,
the maximum total number of hours that Mary Lou worked yesterday to receive the equivalent of 12
hours at her usual pay was:
(A) 11 (B) 10 (C) 9 (D) 8 (E) 7
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