1.

A dealer sells a toyfor Rs 24 and gains as much per cent as the cost price of the toy. Find thecost price of the toy.

Answer» Let cost price be=>`Rs.x`
Gain=x% of C.P=`x xx x/100=x^2/100`
S.P=C.P+Gain
`24=x+x^2/100`
`x^2+100x-2400=0`
`(x+120)(x-20)=0`
x cannot be negative so `x`=cost price =`Rs.20`


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