Originally Posted by

**Sooda** Solving this problem like Swlabr suggested seems professional way. Though I prefer step by step explanations and answers, that way I can examine and learn more.

Math should be logical (that is why I registered here -- to learn). I have finished high school in USA terms and have idea how to get answer.

I am going to subtract percentages until I get manufacturer production cost, it should be possible.

30% from 1470 is 1470 * 0.3 = 441, Retailer got it for 1470 - 441 = 1029

20% from 1029 is 1029 * 0.2 = 205.8,Wholesaler got it for 1029 - 205.8 = 823.2

15% from 823.2 is 823.2 * 0.15 = 123.48, Manufacturer production cost was 823.2 - 123.48 = 699.72 ($)

Hi-fi system costs 699.72 $.

I am learning by doing.