Question

by selling a pen Rs 640a shopkeeper earns a profit of 28%.How much did it cost shopkreeker

Answer 1

THE CORRECT ANSWER IS
640 = x+(x*28/100)

640 = x+(0.28x)

640 = 1.28x

500 = x

ANSWER ISX=500

Answer 2

Hiii..
Here is your answer..

Solution:-
Selling Price=₹640
Profit =28℅
Let the Cp be x.

A/q
$= > 640 = x + x \times \frac{28}{100} [tex] = > 640 = x + \frac{28}{100}x \\ = > 640 = \frac{100x + 28x}{100} \\ = > 640 = \frac{128}{100} x$
$= > 640 = 1.28x \\ = > x = \frac{640}{1.28} \\ = > x = 500$
Hence,
Cost Price =₹500

Hope it helps uh..