✿ [tex]\mathsf{Simple\;Interest = (\frac{Principal \times Rate\;of\;Interest \times Time\;period}{100})}[/tex]
Given : Principal = $820
Given : Rate of Interest = 4%
Given : Time period = 3 yrs
[tex]\mathsf{\implies Simple\;Interest = \frac{(820)(4)(3)}{100}}[/tex]
[tex]\mathsf{\implies Simple\;Interest = (8.2)(12)}[/tex]
[tex]\mathsf{\implies Simple\;Interest = 98.40}[/tex]
Option (C) is the Answer