A salesman's income consists of a commission and a base salary of $400 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?
Pick one
A) $150	B) $245	C) $365	D) $315	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 $350*2= 
<gadget id="calculator">350*2</gadget>
<output>700</output>
$700   Therefore, commission=$1430-$800=$630 for 2 weeks   Avg weekly commission1430- 800= 
<gadget id="calculator">1430- 800</gadget>
<output>630</output>
$630 for 2 weeks   Avg weekly commission=$315   Answer $315
<result>D</result>
A salesman's income consists of a commission and a base salary of $400 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?