Final answer:
To calculate the simple interest, use the formula: Interest = Principal × Rate × Time. For the given values of principal $9000, rate 11%, and time 1 year, the simple interest is $990.
Step-by-step explanation:
To calculate the simple interest, we use the formula: Interest = Principal × Rate × Time.
Given:
- Principal = $9000
- Rate = 11%
- Time = 1 year
Using the given values in the formula, we get:
Interest = $9000 × 0.11 × 1 = $990
Therefore, the simple interest for these values is $990, so the correct answer is (a) $990.