What will be simple interest for 1 year 4 months on a sum of RS 25800 at the rate of 14 % p.a. ?   

Dear Student,
Time = 1 year 4 months = 1 + 4/12 years = 1 + 1/3 years = 4/3 years
Rate = 14% pa
Principle = Rs 25800
$S.I\hspace{0.17em}= \frac{P\times R\times T}{100} = \frac{25800 \times 14\times {\displaystyle \frac{4}{3}}}{100} = 4816$

Regards,