A certain machine produces 850 units of product P per hour. Working continuously at this constant rate, this machine will produce how many units of product P in 7 days?  Choose the most appropriate option:
A) 7,000
B) 24,000
C) 40,000
D) 142,800
E) 168,000
Since 7 days consist of 24*7 hours the total hours of a week is 168 hours.   Since every hour the machine produces 850 units of product P the total product during 168 hours is 850*168=142,800.   Correct Option : 142,800
<result>D</result>
A certain machine produces 850 units of product P per hour. Working continuously at this constant rate, this machine will produce how many units of product P in 7 days?