Question

The average cost of three mobiles A, B and C of a certain company is Rs. 48000. The average cost decrease by 10 % when mobile D of the same company is included, find the cost price of mobile D?

• A. Rs. 27500
• B. Rs. 28800
• C. Rs. 25500
• D. Rs. 29800

Answer 1

Answer:

B. Rs. 28800

The average cost of three mobiles A, B and C = 48000 Total cost of three mobiles A, B and C = 48000*3 = 144000 Average cost of mobiles A, B, C and D = 48000*(90/100) = 43200 Total cost of Four mobiles A, B, C and D = 43200*4 = 172800 The cost price of mobile D = 172800 - 144000 = Rs. 28800