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 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 Correct Answer 10%

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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