A sum of money amounts to Tk. 9800 after 5 years and Tk. 12005 after 8 years at the same rate of simple interest per annual is :

A sum of money amounts to Tk. 9800 after 5 years and Tk. 12005 after 8 years at the same rate of simple interest per annual is : Correct Answer 12%

Hints: 8 বছর এবং 5 বছর এর মাঝের 3 বছরের interest = ( 12005 - 9800) = 2205 Simple interest 5 বছরের জন্য = ( 2205/3 × 5) = 3675 Principle = (9800 - 3675) = 6125 Rate = {(100 × 3675)/(6125 × 5)}% = 12%
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