1 . A bond gets matured in 10 years . invested TK. 42,000 in this bond and received Tk. 105000 once the bond matured . If the bond was under simple interest . then what was the rate of interest per annum?

• A. 10%
• B. 12.5%
• C. 15%
• D. 7.5%

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Answer: Option C

Explanation: