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Compound Interest

Quiz yourself by thinking what should be in each of the black spaces below before clicking on it to display the answer.
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Question
Answer
At what rate a sum of R1800 will become R2700 in 10 years ?   5%  
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A sum of R1600 lent at 12.5% will become twice in how many years ?   8 years  
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John took a loan for 6 years at 5% .If the total interest paid was R1230, the principal was ?   R4100  
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If R1200 amounts to R1440 in 5 years find the rate of interest   4%  
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If a sum of R1600 gives a simple interest of R252 in two years and 3 months , then the rate is ?   7%  
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In what time will Rs. 72 become Rs.81 at 6 1/4 % ?   2 years  
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A sum of money doubles itself in 5 1/2 years ,in what time will it triple itself ?   11 years  
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At what rate a sum will double itself in 16 years ?   6 1/4 %  
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On retirement a person gets R153 000 which he invests in a scheme at 20% p.a. ,find his monthly income.   R2550  
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Find the sum required to earn a monthly income of R600 at 6% p.a.   R120 000  
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A sum of money amounts to R2520 in 2 years and R2700 in 5 years , find the rate   2 1/2%  
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A sum of money doubles itself in 7 years , in how many years it becomes four fold ?   21 years  
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John lent R8000 to his friend for 3 years at 5% p.a. c.i. ,what amount will John get after 3 years ?   R9261  
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Compute the c.I. on R4000 for 1 1/2 years at 10% p.a. compounded half yearly.   R630.50  
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A sum becomes R1352 in 2 years at 4% C.I. Find the sum.   R1250  
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Find the C.I. that A man will get by investing R3000 for 2 years at 5% p.a.   R307.50  
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Find the C.I. on R400 for 9 months at 6% p.a. compounded quarterly   R18.27  
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In what time will R800 amount to R882 at 5% C.I. ?   2 years  
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What sum of money lent out at C.I. will amount to R968 in 2 years at 10% p.a. ?   R800  
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Find the difference between S.I. and C.I. on R31250 in 2 years at 4% p.a.   R50  
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At what rate (C.I.)will R1000 amount to R1313 in 3 years?   10%  
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A sum of money at C.I. amounts to thrice itself in 3 years . In how many years will it be 9 times of itself ?   6 years  
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In how many years will a sum of R800 amounts to R926.10 at 10% p.a. compounded half yearly ?   1 1/2 years  
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The C.I.on a certain sum for 2 years at 10% p.a. is R420 . Find the S.I. at the same rate for same time   R400  
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