Simple Interest
 

  1. Question: The simple interest at `x%`for x years wiil be Rs. x on a sum of :

    A
    `Rs. x`

    B
    `Rs. 100x`

    C
    `Rs. (100/x)`

    D
    `Rs. (100/x^2)`

    Note: Sum` = (100 xx S.I)/(Rate xx Time)` `= (100 xx x)/(x xx x)` `= Rs. (100/x)`
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  2. Question: If Rs. `64` amount to Rs `83.20` in `2` years, what will Rs. `86` amount to in `4` years at the same rate percent per annum ?

    A
    `Rs. 127.40`

    B
    `Rs. 124.70`

    C
    `Rs. 114.80`

    D
    `Rs. 137.60`

    Note: P `= Rs. 64`, T` = 2 years`, S.I` = Rs. 19.20`. Rate `= ((100 xx 19.20)/(64 xx 2))%` `= 15%` Now, P `= Rs. 86`, T` = 4 `years, R` = 15%` `:. S.I = Rs.((86 xx 4 xx 15)/100)` `= Rs. 51.60`. :. Amount` = Rs. (86 + 51.60)` `= Rs. 137.60`.
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  3. Question: The simple interest on a sum of money at `5%` is Rs.`48` for `4` years. The simple interest on the same sum for `5` years at `4%`will be :

    A
    `Rs. 400`

    B
    `Rs. 48`

    C
    `Rs. 50`

    D
    `Rs. 60`

    Note: Principal `= Rs. ((100 xx 48)/(5 xx 4))` `= Rs. 240` `S.I = Rs.((240 xx 5 xx 4)/(100))` `= Rs. 48`.
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  4. Question: A certain sum of money lent out at S.I. amounts to Rs.`690` in `3` years and Rs.`750` in years .The sum lent is :

    A
    `Rs. 400`

    B
    `Rs. 450`

    C
    `Rs. 500`

    D
    `Rs. 600`

    Note: S.I for `2` years `= (750 - 690)` `= Rs. 60` S.I for `3` years `= Rs. (60/2 xx 3)` `= Rs. 90` :. principal `= Rs. (690 - 90)` `= Rs. 600`
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  5. Question: A certain sum of money at simple interest amounts to Rs.`2240` in `2` years and to Rs.`2600` in `5` years. What is the principal amount ?

    A
    `2.5%`

    B
    ``3%`

    C
    `4%`

    D
    `5%`

    Note: S.I for `1 1/2 `Years `= Rs. (1067.20 - 1012)` `= 55.20` S.I for `2 1/2` years `= Rs. (55.20 xx 2/3 xx 5/2)` `= Rs.92` `:. principal = Rs. (1012 - 92)` `= Rs. 920` `:. Rate = (100 xx 92 xx 2)/(920 xx 5)` `= 4%`
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  6. Question: A sum of money at simple interest amounts to Rs. `2240` in `2` years and to Rs. `2600` in `5` years. What is the principal amount ?

    A
    `Rs. 1520`

    B
    `Rs. 1880`

    C
    `Rs. 2120`

    D
    None

    Note: S.I for `3` years `= Rs. (2600 - 2240)` `= Rs. 360` S.I for `2` years `= Rs. (360/3 xx 2)` `= Rs. 240` :. principal `= Rs. (2240 - 240)` `= Rs. 2000`
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  7. Question: For how money years should Rs. `600` be invested at `10%`p.a. in order to earn the same simple interest as is earned by investing Rs. `800` at `12%` p.a.for `5` years ?

    A
    `6`

    B
    `8`

    C
    `12`

    D
    `16`

    Note: S.I required `= Rs.((800 xx 12 xx 5)/100)` `= Rs. 480` `Time = ((100 xx 480)/(600 xx 10)) years` `= Rs. 8`
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  8. Question: The simple interest on a certain sum of money at the rate of `5%` for `8` years is Rs.`840`.At what rate of interest the same amount of interest can be received on the same sum after `5` years ?

    A
    `6%`

    B
    `8%`

    C
    `9%`

    D
    `10%`

    Note: sun`= Rs. ((100 xx 840)/(5 xx 8))` `= Rs. 2100`. Rate required `= ((100 xx 840)/(2100 xx 5))%` `= 8%`
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  9. Question: A person takes a loan of Rs.`200`at `5%` simple interest .He returns Rs.`100` at the end of `1` year. In order to clear his dues at the end of `2`years, he would pay ?

    A
    `Rs. 115.50`

    B
    `Rs. 110`

    C
    `Rs. 115`

    D
    `Rs. 100`

    Note: Amount to be paid `= Rs.(100 + (200 xx 5 xx 1)/(100) + (100 xx 5 xx 1)/(100))` `= Rs. 115`
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  10. Question: The simple interest on Rs.`10` for `4` month at the rate of `3` paise per rupee per month is

    A
    `Rs. 1.20`

    B
    `Rs, 12`

    C
    `Rs.120`

    D
    `Rs. 1200`

    Note: S.I` = Rs. (10 xx 3/100 xx 4)` `= Rs. 1.20`
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