Answer: C
Original value is percentage = 100 %.
Reduce amount in percentage = 10 %
Therefore, Percent value in percentage = 100 % - 10 % = 90 %.
According to the problem,
90 % of original value = 1080.
Therefore, 100 % of original value = 1080/100 × 90 = 1200.
Thus, the original value was 1200.