A certain principal amount, invested at simple interest, grows to Tk. 950 after 3 years and Tk. 1010 after 4 years. What is the original principal amount?


A

Tk. 800


B

Tk. 720


C

Tk. 650


D

Tk. 770


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Question: A certain principal amount, invested at simple interest, grows to Tk. 950 after 3 years and Tk. 1010 after 4 years. What is the original principal amount?

Solution:
Given,
Amount after 3 years = Tk. 950
Amount after 4 years = Tk. 1010
∴ Interest for 1 year = 1010 - 950 = Tk. 60

∴ Interest for 3 years = 60 × 3 = Tk. 180

∴ Principal = 950 - 180 = Tk. 770

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Updated: 1 day ago

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