Question

calculate the amount and compound interest on:
1) Rs 15000 for 2 yrs at 10% per annum compounded annually
2) Rs 100000 for 9 months at 4% per annum compounded quarterly

plz explain EVERYTHING
plz this is very urgent ​

Answer 1

Hope it will help you

Step-by-step explanation:

1) Principal=15000

Time =2years

Rate=10%

Amount =p×(1+r/100)×r or n

A= 15000(1+10/100)×n

A=15000(100+10/100)×2

A=15000×110/100×2

A=33000

CI=A-P

CI=33000-15000

CI=18000

2) It is given that 

Principal (P) = 100000

Rate of interest = 4% p.a. or 1% quarterly 

Period (n) = 9 months or 3 quarters 

We know that 

 P(1+r/100)n 

Substituting the values 

= 100000(1+1/100)3

By further calculation 

=100000×101/100×101/100×101/100

= 103030.10

Here 

CI = A - P

Substituting the values 

= 103030.10−100000

= 3030.10

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