what is the original price of pack of milk powder which Zahid has bought for taka 100, after receiving a discount of 20% ?

what is the original price of pack of milk powder which Zahid has bought for taka 100, after receiving a discount of 20% ? Correct Answer Tk. 125

Let the original price be A. Then, A - 20% of A = 100 or, A - A/5 = 100 or, 4A/5 = 100 or, A = 100×5 / 4 = 125 TK
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The exchange rate is the ruling official rate of exchange of Taka for other currencies. It determines the value of Bangladeshi goods in relation to foreign foods. If the Taka is devalued in terms other currencies Bangladeshi exports (which are paid for in Taka ) become cheaper to foreigners and Bangladeshi imports become more expensive to holders of Taka. What conclusion can be drawn form the information above?