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Earn 100

A sum of  850 is lent in the beginning of a year of a certain rate of interest. After 8 months, a sum of  210 more is lent but at the rate twice the former. At the end of the year,  19.80 is earned as interest from both the loans. What was the original rate of interest?

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Important Questions on Simple Interest

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If x is the simple interest on y and y is the simple interest on z, the rate per cent and the time being the same in both cases, what is the relation between x, y and z?
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The simple interest on a sum of money is 19 of the principal and the number of years is equal to the rate per cent p.a. The rate per cent p.a. is
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The simple interest on a certain sum of money at 4 per cent p.a. for 4 years is  80 more than interest on the same sum for 3 years at 5 per cent p.a. Find the sum of money.
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The simple interest on  800 at 6 per cent per month for 9 months is
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If  450 amount to  540 in 4 years, what will it amount to in 6 years at the same rate per cent?
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A sum fetched total simple interest of  4,016.25 at the rate of 9 per cent p.a. in 5 years. What is the sum?
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At 5 per cent SI, a sum of  500 fetches  36 more than the amount of interest accrued on  380 for same period. Find time.
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Namrata deposited  8,000 which amounted to  9,200 after 3 years at simple interest. Had the interest been 2 per cent more, how much would she get?