300টাকার 4 বছরের সরল মুনাফা ও 400 টাকার 5 বছরের সরল মুনাফা একত্রে 160 টাকা হলে শতকরা মুনাফার হার কত?
A. 6%
B. 5%
C. 7%
D. 8%
সঠিক উত্তরঃ
B.
5%
Explanation:
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