simple and compound interest problems

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Hi friends,
In this post we are about to learn how to calculate simple interest and compound interest problems with some short tricks. In exams we don’t have time to calculate on paper with formulas. we have to it in mind so quickly because Every second matter in examination hall.

Now, here are some shortcut tricks for Simple Interest (S.I) and Compound interest (C.I.) with these i think you sure have some help in these chapter

lets first thing to do is learn some PERCENTAGE basic.

SIMPLE INTEREST

we have using these BASIC formulas

S.I. = PxRxT / 100

BUT there are some example how these shortcut tricks that

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Type 1.

In how many years will a sum of money double itself at 12% per annum?
a. 6years 6 months
b. 7 years 6 months
c. 8 years 3 months
d. 8 years 4 months

Type 2.
at what rate of percent of simple interest will a sum of money double itself in 12 years?
a. 8%
b. 8.1/3%
c. 8.1/2%
d. 9.1/2%

Type 3.

The rate at which a sum become four times of itself in 15 years at simple interest will be?
a.15%
b. 17.1/2%
c. 20%
d. 25%

Type 4.

if a sum of money at simple interest double in 6 years. it will become 4 time in ?
a. 12 years
b. 14 years
c. 16 years
d. 18 years

Type 5.

How long will it take a sum of money invested at 5% p.a. by simple interest to increase it value by 40%?
a. 5 years
b. 6 years.
c. 7 years
d. 8 years

COMPOUND INTEREST PROBLEMS QUESTION TRICKS

Type 1.
a sum of money place at compound interest double itself in 5 years. It will become 8 times itself at same rate of interest in ?
a. 7 years
b. 10 years
c. 15 years
d. 20 years

Type2.

By C.I. at 10 % p.a. a sum increased to 2662 in 3 years what will be the principal amount ?
a. 1000
b. 1500
c. 2000
d. 2500

Type 3.

In C.I, what will be the rate of interest if a sum becomes 1331 in 3 years?
a. 100

b.1000
c.10000
d. none of these

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