Solution -
Given,
P = 1000
R = 10%
T = 3
A = P (1 + (r/100))n
A = 1000 (1 + (10/100))3
A = 1000 ((11/10))3
A = 1000 (1331/1000)
A = 1331
C.I. = Amount - Principal
C.I. = 1331 - 1000
C.I. = 331
The compound interest is 331.
Hence,
The correct answer is option (a) 331.
Thank You