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Garang made a 5 years investment, the interest rate 15%. He earned 11,250 SSP in interest. How much was original investment?

April 28, 2026Mathematics

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Here's the solution for the first simple interest problem.

The formula for simple interest is $I = P \cdot R \cdot T$ , where:

$I$ is the interest earned
$P$ is the principal amount (original investment)
$R$ is the annual interest rate (as a decimal)
$T$ is the time in years

Question 1: Garang made a 5 years investment, the interest rate 15%. He earned 11,250 SSP in interest. How much was original investment?

Identify the given values.
Given:
Interest ( $I$ ) = 11,250 SSP
Time ( $T$ ) = 5 years
Rate ( $R$ ) = 15% = 0.15
Use the simple interest formula to find the principal ( $P$ ).
$I = P \cdot R \cdot T$
Rearrange the formula to solve for $P$ :
$P = \frac{I}{R \cdot T}$
Substitute the given values:
$P = \frac{11250}{0.15 \cdot 5}$ $P = \frac{11250}{0.75}$ $P = 15000$
The original investment was 15,000 SSP.

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