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The simple interest on a certain sum of money at the years is Rs. 840. Rate of interest for which the same amount of interest can be received on the same sum after 5 years is = ?

17%
28%
39%
410%

Answer:- 1

Explanation:-

Solution:

\begin{aligned} C a s e - I : \\ SI % = R % \times t \\ SI % = 5 % \times 8 \\ = 40 % \\ C a s e - I I : \\ SI % = 5 \times r % \\ According to the question \\ \Rightarrow 40 % = 5 \times r % \\ \Rightarrow r % = 8 % \end{aligned}

$\eqalign{ & {\bf{Case - I:}} \cr & {\text{SI}}\% = {\text{R}}\% \times {\text{t}} \cr & {\text{SI}}\% = {\text{5}}\% \times {\text{8}} \cr & = {\text{40}}\% \cr & {\bf{Case - II:}} \cr & {\text{SI}}\% = {\text{5}} \times {\text{r}}\% {\text{ }} \cr & {\text{According to the question}} \cr & \Rightarrow {\text{40}}\% = {\text{5}} \times {\text{r}}\% \cr & \Rightarrow {\text{r}}\% = {\text{8}}\% \cr}$

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", "dateCreated": "7/24/2019 10:09:12 AM", "author": { "@type": "Person", "name": "Nitin Sir" } }, "suggestedAnswer": { "@type": "Answer", "text": "

Solution:

\begin{aligned} C a s e - I : \\ SI % = R % \times t \\ SI % = 5 % \times 8 \\ = 40 % \\ C a s e - I I : \\ SI % = 5 \times r % \\ According to the question \\ \Rightarrow 40 % = 5 \times r % \\ \Rightarrow r % = 8 % \end{aligned}

$\eqalign{ & {\bf{Case - I:}} \cr & {\text{SI}}\% = {\text{R}}\% \times {\text{t}} \cr & {\text{SI}}\% = {\text{5}}\% \times {\text{8}} \cr & = {\text{40}}\% \cr & {\bf{Case - II:}} \cr & {\text{SI}}\% = {\text{5}} \times {\text{r}}\% {\text{ }} \cr & {\text{According to the question}} \cr & \Rightarrow {\text{40}}\% = {\text{5}} \times {\text{r}}\% \cr & \Rightarrow {\text{r}}\% = {\text{8}}\% \cr}$ ", "dateCreated": "7/24/2019 10:09:12 AM" } }

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