Discussion Forum



1)

It costs Rs. x each to make the first thousand copies of a compact disc and Rs. y to make each subsequent copy. If z is greater than 1000, how much will it cost to make z copies of the compact disc ?


A) zx - zy

B) 1000x + yz

C) 1000 (x - y) + yz

D) 1000 (z - y) + xz

Answer:

Option C

Explanation:

The first 1000 copies will cost Rs.x each. So the total cost of first 1000 copies = Rs.1000x
The remaining z - 1000 copies will cost Rs.y each.
So the cost of the z - 1000 = Rs.(z - 1000)y
Therefore, total cost = 1000x + zy - 1000y = 1000(x-y) + yz