A salt manufacturing company produced a total of 5000 tonnes of salt in January of a particular year. Starting from February its production increased by 180 tonnes every month over the previous months until the end of the year. Find its average monthly production for that year?	Pick one:  A) 2989  B) 2765  C) 6000  D) 2989  E) 9772
Total production of salt by the company in that year   = 5000 + 5180 + 5360 + .... + 6980 = 72060.   Average monthly production of salt for that year   = 72060/12= 
<gadget id="calculator">72060/12</gadget>
<output>6_005</output>
6005.   Answer:6000
<result>C</result>
A salt manufacturing company produced a total of 5000 tonnes of salt in January of a particular year. Starting from February its production increased by 180 tonnes every month over the previous months until the end of the year. Find its average monthly production for that year?