If the interest on Taka 500 for 4 years and Taka 600 for 5 years is Taka 500; what will be the rate of interest?

If the interest on Taka 500 for 4 years and Taka 600 for 5 years is Taka 500; what will be the rate of interest? Correct Answer 10%

We know,  Interest,  I = P n r Now,  500×4×r + 600×5×r = 500 or,  2000r + 3000r = 500 or,  5000r = 500 or,  r = 500/5000×100% = 10%
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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?