Subject
Quantitative Aptitude
Topic
Interest
. A sum of money at simple interest amounts to Tk.1012 in 2 ½ years and to Tk.20 in 4 yeaTk. The rate of interest per annum is
. A sum of money at simple interest amounts to Tk.1012 in 2 ½ years and to Tk.20 in 4 yeaTk. The rate of interest per annum is
ক)
2.5%খ)
3%গ)
4%ঘ)
5%Explanation
Amount, A = P + S I for 2 ½ years = Tk.1012 Amount for 4 years = Tk.1067.20. Therefore, S I for 1 ½ years = Tk.1067.20 – Tk.1012 = Tk.55.20 So, S I for 2 ½ years = 55.20 ÷ 3/2 × 5/2 = 55.20 × 2/3 × 5/2 = Tk.92. Therefore, the Principal = Amount – S I = 1012 – 92 = Tk.920. Rate of interest = S I × 100/P n = 92 × 100/920 × 5/2 = 92 × 100 × 2 / 920 × 5 = 4%.Related questions
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