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1. A person deposited Tk. 400 for 2 years, Tk. 550 for 4 years and Tk. 1200 for 6 years. He received the total simple interest of Tk. 1020. The rate of interest per annum is
- A. 10%
- B. 10%
- C. 10%
- D. 10%
Answer: Option A
Explanation:
ধরি, সুদের হার r %
400 × 2 × r/100 + 550 × 4 × r/100 + 1200 × 6 × r/100 = 1020
8r + 22r + 72r = 1020
102r = 1020
r = 10 %
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