Kirk sells cars. On two sales, Kirk has received commissions of $850, and $705, and he has one additional sale pending. If Kirk is to receive an average (arithmetic mean) commission of exactly $820 on the three sales, then the third commission must be:  Choose the correct choice from the following answers
A) $895 B) $905 C) $910 D) $915 E) $945
Let X be the third value.   850 + 705 + X = 820 * 3   =&gt; 1555 + X = 2460   =&gt; X = 905.   Answer: $905
<result>B</result>
Kirk sells cars. On two sales, Kirk has received commissions of $850, and $705, and he has one additional sale pending. If Kirk is to receive an average (arithmetic mean) commission of exactly $820 on the three sales, then the third commission must be: