Find the rate at which naira 280 will earn naira 21.00 simple lnterest for 2 and a1/2

There are a few missing pieces of information needed to solve this problem, such as the interest rate and the time period. Without this information, we cannot provide a solution.

Why? please

The formula to calculate simple interest is:

I = P * r * t

Where:
I = simple interest
P = principal amount
r = interest rate (per time period)
t = time period

Based on the given information, we have:
- Principal amount (P) = 280 Naira
- Simple interest (I) = 21.00 Naira
- Time period (t) = 2.5 (assuming 2 and a half years)

However, we don't have the interest rate (r) which is necessary to solve for it using the formula:

r = I / (P * t)

Without knowing the interest rate, we cannot find the rate at which 280 Naira will earn 21 Naira simple interest for 2 and a half years.

To find the rate at which Naira 280 will earn Naira 21.00 simple interest for 2 and a half years, we need to use the formula for simple interest:

Simple Interest = (Principal * Rate * Time) / 100

In this case, the Principal is Naira 280, the Simple Interest is Naira 21.00, and the Time is 2 and a half years (or 2.5 years).

Let's plug these values into the formula and solve for the Rate:

21 = (280 * Rate * 2.5) / 100

To isolate the Rate, we can multiply both sides of the equation by 100 and divide by 280 * 2.5:

21 * 280 * 2.5 = Rate

Rate = (21 * 280 * 2.5) / 280

Rate = 1.875

Therefore, the rate at which Naira 280 will earn Naira 21.00 simple interest for 2 and a half years is 1.875%.