Question

find after how many years will Raju earn rs 8400 as interest , if he has in account rs 21000 an interest rate is 8% per year​

Answer 1

Given :-

• Interest = Rs,8400
• Principal = Rs,21000
• Rate = 8%

To Find :-

• Time

Solution :-

⇒ Interest = Principal × Rate × Time / 100

⇒ 8400 = 21000 × 8 × Time / 100

⇒ 8400 = 210 × 8 × Time

⇒ 8400 = 1680 × Time

⇒ 8400 ÷ 1680 = Time

⇒ 5 years = Time

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Verification :-

⇒ Interest = Principal × Rate × Time / 100

⇒ 8400 = 21000 × 8 × 5 / 100

⇒ 8400 = 210 × 8 × 5

⇒ 8400 = 210 × 40

⇒ 8400 = 8400

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Therefore, Raju will earn Rs,8400 after 5years

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