Solution: Let Principal be $R, Rate =R% p.a, Time =t years.
(i) When interest is compounded annually:
Amount after t years
(ii) When interest is compounded half-yearly:
Principal = $R, Rate =R% p.a=(R/2)% per half-yearly,Time =t years=(2t) half-years
Amount after t years
(iii) When interest is compounded quarterly:
Principal = $R, Rate =R% p.a=(R/4)% per quarter,Time = t years=(4t) quarters.
Amount after t years
(iv) When interest is compounded monthly:
Principal = $R, Rate =R% p.a=(R/12)% per month,Time = t years=(12t) months.
Amount after t years
In our problem, I borrow $10 per month from my friend. On each of these loans, my friend charges 30% in interest per year, compounded monthly.
For 12th month loan amount = $10.
Number of months of interest =0
Therefore, amount owed on loan at the end of the year =$10(No interest)
For 11th month loan amount = $10.
Number of months of interest =1
Therefore, amount owed on loan at the end of the year
For 10th month loan amount = $10.
Number of months of interest =2
Therefore, amount owed on loan at the end of the year
For 9th month loan amount = $10.
Number of months of interest =3
Therefore, amount owed on loan at the end of the year
For 8th month loan amount = $10.
Number of months of interest =4
Therefore, amount owed on loan at the end of the year
For 7th month loan amount = $10.
Number of months of interest =5
Therefore, amount owed on loan at the end of the year
For 6th month loan amount = $10.
Number of months of interest =6
Therefore, amount owed on loan at the end of the year
For 5th month loan amount = $10.
Number of months of interest =7
Therefore, amount owed on loan at the end of the year
For 4th month loan amount = $10.
Number of months of interest =8
Therefore, amount owed on loan at the end of the year
For 3rd month loan amount = $10.
Number of months of interest =9
Therefore, amount owed on loan at the end of the year
For 2nd month loan amount = $10.
Number of months of interest =10
Therefore, amount owed on loan at the end of the year
For 1st month loan amount = $10.
Number of months of interest =11
Therefore, amount owed on loan at the end of the year
Therefore,
Month | Loan amount |
Number of months of interest |
Amount owed on loan at the end of the year |
12 | $10 | 0 | $10 |
11 | $10 | 1 | 10.25 |
10 | $10 | 2 | 10.50 |
9 | $10 | 3 | 10.768 |
8 | $10 | 4 | 11.038 |
7 | $10 | 5 | 11.314 |
6 | $10 | 6 | 11.596 |
5 | $10 | 7 | 11.886 |
4 | $10 | 8 | 12.18 |
3 | $10 | 9 | 12.488 |
2 | $10 | 10 | 12.8 |
1 | $10 | 11 | 13.12 |
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