If a simple interest of Rs.72 will be obtained after 6 months at the rate of 3 percent per annum, then the principal amount would be: (in Rs.)

Given:

The simple interest of Rs.72 will be obtained after 6 months at the rate of 3 percent per annum.

Concept:

\( S.I = \frac{P\times R\times T}{100}\)

P is the principal amount.

R is the rate of interest per annum.

T is the time period in years.

Solution:

According to the question,

The simple interest of Rs.72 will be obtained after 6 months at the rate of 3 percent per annum.

\(72 = \frac{P\times 3\times \frac{1}{2}}{100}\)

\( \frac{7200}{1.5} = P\)

P = 4800

Hence, option 4 is correct.