The simple interest on Rs. 1,280 at 5% p.a. in 3 years is:

Correct option is A

Given:

Principal (P) = Rs. 1,280

Rate of interest (R) = 5% per annum

Time (T) = 3 years

Formula Used:

Simple Interest = $$\frac{P \times R \times T}{100}$$​​

Solution:

SI = $$\frac{1280 \times 5 \times 3}{100} = \frac{19200}{100}$$​ = 192

Thus, the simple interest on Rs. 1,280 at 5% p.a. in 3 years is Rs. 192.