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The average cost of three mobiles A, B and C of a certain company is Rs. 30000. The average cost decrease by 20% when mobile D of the same company is included. What is the cost price of mobile D?

A5800

B6400

C7500

D6000

Answer:

D. 6000

Read Explanation:

Total cost of mobiles A, B and C= 30000*3 = Rs. 90000 Average cost of A, B, C and D= 30000*(80/100) = Rs. 24000 Total cost four mobile= 24000*4 = Rs. 96000 Cost of mobile D= 96000-90000 = Rs. 6000


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