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1. Tk.6000 becomes Tk.7200 in 4 years at a certain rate of simple interest. If the rate becomes 1.5 times of itself, the amount of same principal in 5 years will be-
- A. Tk.8000
- B. Tk.8000
- C. Tk.8000
- D. Tk.8000
Answer: Option B
Explanation:
Capital, P= 6000 tk
Capital + 4 Year's Interest = 7200 tk
4 Year's Interest = 7200-6000 = 1200 tk
1 Year's Interest = 1200/4 = 300 tk
Interest rate = (300÷6000)×100 = 5%
New Interest Rate, r = 5×1.5 = 7.5%
Year, n = 5
So, the amount = P ( 1 + n.r )
= 6000 { 1 + 5× (7.5÷100)}
= 6000 × 1.375
= 8250 tk.
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