By selling a book for TK. 56, gain is as much percent as it costs in taka. The cost price is :

TK. 280

TK. 40

TK. 360

TK. 140

TK. 500

Description (বিবরণ) :

প্রশ্ন: By selling a book for TK. 56, gain is as much percent as it costs in taka. The cost price is :

ব্যাখ্যা:

Let cost price Tk. x

x + x/100 × x = 56

100 x + x2 = 5600

x2 + 100x - 5600 = 0

x2 + 140 x - 40 x - 5600 = 0

x ( x + 140) - 40 ( x + 140) = 0

( x + 140) ( x - 40) = 0

x = - 140 ( not acceptable)

x = 40

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