Question

$pls \: help \: me$
​

Answer 1

Answer:

Cost price are 17.23 rupees.

Step-by-step explanation:

1. Here it is given that

Selling price (S.P)= 20.20

Let cost price (C.P)= x

Percentage of profit = x%

2. Selling price(S.P) = Cost Price (C.P) + Profit

\mathbf{20.20= x + \frac{x}{100}\times x}20.20=x+

100

x

×x

\mathbf{20.20= x + \frac{x^{2}}{100}}20.20=x+

100

x

2

\mathbf{2020=100x+x^{2}}2020=100x+x

2

\mathbf{x^{2}+100x-2020=0}x

2

+100x−2020=0

So

\mathbf{x=\frac{-100\mp \sqrt{\left ( 100^{2}-4\times 1\times (-2020) \right )}}{2}}x=

2

−100∓

(100

2

−4×1×(−2020))

After solving above we get

x= 17.32

So cost price = 17.32 rupees

and percentage of profit = 17.32