Question

rupees 8000 is invested at 5 1 / 4% per annum simple interest for 3 1/2 years find the interest and the final amount​

Answer 1

Answer:

simple interest= 1470

final amount = 9470

Step-by-step explanation:

5 1/4% = 21/4%

3 1/2 yrs = 7/2 yrs

formula of simple interest = p×n×r/100

therefore , 8000×21×7/100×4×2

= 1470

Simple interest is 1470 rs

Amount = principal + interest

A = 8000 + 1470

A = 9470

Amount is 9470 rs

Answer 2

Given: Principal (P) = Rs. 8,000, Rate of interest (R) = $5\frac{1}{4} %$ %

           Time (T) = $3\frac{1}{2}$ years

To find: Simple interest and final amount

Solution: Using the formula for Simple Interest:

∵ $Simple Interest = \frac{P \ *\ R \ * \ T}{100}$

                            = $\frac{8000 \ * \ 5\frac{1}{4} \ * \ 3\frac{1}{2} }{100}$

                            = $\frac{8000 \ * \ 21 \ * \ 7}{100 \ * \ 4 \ * \ 2} = 1470$

Now, Amount = Principal + Interest

Final amount = 8,000 + 1,470 = Rs. 9,470

Hence, the simple interest on rupees 8,000 invested at 5$\frac{1}{4}$ % per annum interest for 3$\frac{1}{2}$ years is Rs. 1470 and final amount is Rs. 9,470.