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Earn 100

A sum of is lent in the beginning of a year of a certain rate of interest. After months, a sum of more is lent but at the rate twice the former. At the end of the year, is earned as interest from both the loans. What was the original rate of interest?
(a) per cent
(b) per cent
(c) per cent
(d) per cent
(e)None

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Important Questions on Simple Interest
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If is the simple interest on and is the simple interest on , the rate per cent and the time being the same in both cases, what is the relation between and ?

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The simple interest on a sum of money is 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 per cent p.a. for years is more than interest on the same sum for years at per cent p.a. Find the sum of money.

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The simple interest on at per cent per month for months is

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If amount to in years, what will it amount to in years at the same rate per cent?

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A sum fetched total simple interest of at the rate of per cent p.a. in years. What is the sum?

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At per cent SI, a sum of fetches more than the amount of interest accrued on for same period. Find time.

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Namrata deposited which amounted to after years at simple interest. Had the interest been per cent more, how much would she get?
