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 one
A) $150 B) $290 C) $365 D) $715 E) $730
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 weeks556+ 413+ 420+ 436+ 395= 
<gadget id="calculator">556+ 413+ 420+ 436+ 395</gadget>
<output>2_220</output>
$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= 
<gadget id="calculator">350*2</gadget>
<output>700</output>
$700   Therefore, commission=$1280-$700=$580 for 2 weeks   Avg weekly commission1280- 700= 
<gadget id="calculator">1280- 700</gadget>
<output>580</output>
$580 for 2 weeks   Avg weekly commission=$290   Answer $290
<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?