Question

You invest a certain amount of money in a fixed deposit account at 12%
annual interest. After a year, the amount in your account is Rs 8400.
What amount of money had you invested?
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Answer 1

Step-by-step explanation:

suppose ;

here our invested money is x

We know ptr\100=i

where

principal = p; time= t '. r = rate of interest

it is needed by question ;

ptr\100 = 8400

or, x . 1. 12\100 = 8400 [here we put

the values.]

or, 12x = 84000

or, x =70000 [ . =multiple]

answer '. investment is money is 7000.

Answer 2

Answer:

Rs. 7500

Step-by-step explanation:

Here Principal is unknown,

Let's say T is time and R is rate of interest,

Interest =  P  ×  T  ×  R /  100

Interest =  P  ×  1  ×  12  / 100

Amount = P + Interest

8400 = P +  P  ×  12  / 100

840000 = 112 × P

P =  840000 /  112

= Rs 7,500