CAT Exam Numerical Ability Percentage

Bill Ambani, a very clever businessman, started off a business with very little capital. In the first year, he earned a profit of 50% and donated 50% of the total capital to a charitable organisation. The same course was followed in the 2nd and 3rd years also. If at the end of three years, he is left with Rs. 16875, then find the amount donated by him at the end of the 2nd year.

Read Solution (Total 1)

Let capital be x
So profit-=150*x/100=3x/2
Donate =0.5*3x/2=3x/4
Remaining =3x/4
Second year
50%*3x/4=9x/8
Donate =0.5*9x/8=9x/16
Remaing=9x/16
Thired year
1.5*9x/16=27x/64
Remaininfg27x/64
Atq he left with 16875
16875*64/24=40000
Seconde year he donate 9*40000/16=22500
7 years agoHelpfull: Yes(1) No(1)

CAT Other Question

There are 2 water tanks A and B. A is much smaller than B. While water fills at the rate of 1 litre every hour in A, it gets filled up like 10,20,40,80,160... in B. If tank B is 1/32 filled in 21 hours, then what is the total duration of hours required to fill it completely.

(a) 26
(b) 25
(c) 5
(d) 27 A machine depreciates in value each year at the rate of 10% of its previous value. However, every second year there is some maintenance work so that in that particular year, depreciation is only 5% of its previous value. If at the end of the fourth year, the value of the machine stands at Rs. 1, 46,205 then find the value of machine at the start of the first year.