Question

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?

• A. 5800
• B. 6400
• C. 7500
• D. 6000

Answer 1

Answer:

D. 6000

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