Question

- - rate for half year= - 12000(105/100)3=13891.50

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Answer 1

Step-by-step explanation:

It is given that 

Amount after one year = 13230

Amount after 121 years = 13891.50 

So the difference = 13891.50−13230=661.50

Here 661.50 is the interest on 13230 for 21 years 

We know that 

Rate = (661.50×100×2)/(13230×1)

Multiplying and dividing by 100

=(66150×100×2)/(13230×1×100)

=10% p.a.

Here 

A = P(1+r/100)n

Substituting the values 

13891.50=P×21/20×21/20×21/20

So we get 

P=13891.50×20/21×20/21×20/21

P= 12000