12
a person sold his watch for rs 24 and got a percentage of profit equal to the cost price then the cost price is
- Ars 144
- Brs18
- Crs22
- Drs 20
Answer not set
Discussion 1
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CCommunity
Let us assume the cost price be x
Profit percentage is x%
Profit %= profit/cost price * 100
x=(24-x)/x * 100
x²=2400-100x
x²+100x-2400=0
x²+120x-20x-2400=0
x(x+120)-20(x+120)=0
(x-20)(x+120)=0
x can be 20 or -120
As money can't be negative, x is 20
Cost price is rs.20
Profit percentage is x%
Profit %= profit/cost price * 100
x=(24-x)/x * 100
x²=2400-100x
x²+100x-2400=0
x²+120x-20x-2400=0
x(x+120)-20(x+120)=0
(x-20)(x+120)=0
x can be 20 or -120
As money can't be negative, x is 20
Cost price is rs.20