Task: Question Answering
Input (English): Problem: a salesman ' s income consists of a commission and a base salary of $ 350 per week . over the past 5 weeks , his weekly income totals have been $ 556 , $ 413 , $ 420 , $ 436 and $ 395 . what must his average ( arithmetic mean ) commission be per week over the next two weeks so that his average weekly income is $ 500 over the 7 - week period ? 
Options: a ) $ 150 , b ) $ 290 , c ) $ 365 , d ) $ 715 , e ) $ 730
Output (English): b