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The initial investment of C is Rs. 1000 less than the average of the initial investment of A and B together.
initial investment of C = [(y-2000)+(y+4000)]/2 - 1000
= [2y+2000]/2 - 1000
= y+1000-1000
= y
The ratio between the investment of A, B and C with respect to the time = (y-2000)x12 : (y+4000)x4 : yx8
= (y-2000)x3 : (y+4000) : yx2
The ratio between the profits of B and C is 5:8 respectively.
(y+4000)/2y = 5/8
(y+4000)/y = 5/4
4y+16000 = 5y
5y-4y = 16000
y = 16000
Required percentage = [(y-2000)/y]x100
= [(16000-2000)/16000]x100
= [14000/16000]x100
= 14000/160
= 87.5%
Find the successive discounts of 10%,20% and 40%.
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