A salesman's income consists of a commission and a base salary of $370 per week. Over the past 5 weeks, his weekly income totals have been $406, $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) $345	C) $365	D) $715	E) $730
Total weekly income over 5 weeks=$406+$413+$420+$436+$395=$2070   For avg weekly income to be $500 over 7 weeks, we need total weekly income over 7 weeks406+ 413+ 420+ 436+ 395= 
<gadget id="calculator">406+ 413+ 420+ 436+ 395</gadget>
<output>2_070</output>
$2070   For avg weekly income to be $500 over 7 weeks, we need total weekly income over 7 weeks=$3500   Now, $3500-$2070=$1430   From this, we subtract base salary for 2 weeks i.e $370*2= 
<gadget id="calculator">370*2</gadget>
<output>740</output>
$740   Therefore, commission=$1430-$740=$690 for 2 weeks   Avg weekly commission1430- 740= 
<gadget id="calculator">1430- 740</gadget>
<output>690</output>
$690 for 2 weeks   Avg weekly commission=$345   Answer $345
<result>B</result>
A salesman's income consists of a commission and a base salary of $370 per week. Over the past 5 weeks, his weekly income totals have been $406, $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?