Final answer:
To find the simple interest, use the formula I = P × R × T. For a principal of N300, a rate of 10%, and a time of 2.5 years, the interest is N75.
Step-by-step explanation:
To find the simple interest on a principal amount using the simple interest formula, you can use the equation: Interest (I) = Principal (P) × Rate (R) × Time (T), where the rate is in decimal form. In this question, we are given a principal amount of N300, an interest rate of 10%, and a time duration of 2.5 years.
First, convert the interest rate from a percentage to a decimal by dividing by 100. Therefore, 10% becomes 0.10. Then, using the formula:
I = P × R × T
I = N300 × 0.10 × 2.5
I = N300 × 0.25
I = N75
The simple interest accrued over this period is N75. Therefore, the correct answer is (a) N75.