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? Choose the most appropriate option
A) $ 150	B) $ 290	C) $ 365	D) $ 715	E) $ 730
<gadget id="calculator">500 * 7</gadget>
<output>3_500</output>

<gadget id="calculator">556 + 413</gadget>
<output>969</output>

<gadget id="calculator">436 + 420</gadget>
<output>856</output>

<gadget id="calculator">969 + 856</gadget>
<output>1_825</output>

<gadget id="calculator">1_825 + 395</gadget>
<output>2_220</output>

<gadget id="calculator">3_500 - 2_220</gadget>
<output>1_280</output>

<gadget id="calculator">1_280 / 2</gadget>
<output>640</output>

<gadget id="calculator">640 - 350</gadget>
<output>290</output>

<result>B</result>
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?
subtract(divide(subtract(multiply(500, 7), add(add(add(556, 413), add(436, 420)), 395)), const_2), 350)
"total weekly income over 5 weeks = $ 556 + $ 413 + $ 420 + $ 436 + $ 395 = $ 2220 for avg weekly income to be $ 500 over 7 weeks , we need total weekly income over 7 weeks = $ 3500 now , $ 3500 - $ 2220 = $ 1280 from this , we subtract base salary for 2 weeks i . e $ 350 * 2 = $ 700 therefore , commission = $ 1280 - $ 700 = $ 580 for 2 weeks avg weekly commission = $ 290 answer b"