The average wages of a worker during a fortnight comprising of 15 consecutive working days was $90 per day. During the first 7 days, his average wage was $87 per day and the average wage during the last 7 days was $92 per day. What was his wage on the 8th day? Choose one.
A) $83	B) $92	C) $90	D) $97	E) $104
The total wage earned during the 15 days that the worker worked = 15 * 90= 
<gadget id="calculator">15 * 90</gadget>
<output>1_350</output>
$ 1350.   The total wage earned during the first 7 days= 7 * 87= 
<gadget id="calculator">7 * 87</gadget>
<output>609</output>
$ 609.   The total wage earned during the last 7 days= 7 * 92= 
<gadget id="calculator">7 * 92</gadget>
<output>644</output>
$ 644.   Total wage earned during the 15 days= wage during first 7 days + wage on 8th day + wage during the last 7 days.   Or 1350 = 609 + wage on 8th day + 644   Wage on 8th day = 1350 - 609 - 644= 
<gadget id="calculator">1350 - 609 - 644</gadget>
<output>97</output>
$ 97.   Answer $97
<result>D</result>
The average wages of a worker during a fortnight comprising of 15 consecutive working days was $90 per day. During the first 7 days, his average wage was $87 per day and the average wage during the last 7 days was $92 per day. What was his wage on the 8th day?