Based on the calculations, the interest rate on the stock in four (4) years is equal to 7.1%.
Given the following data:
Amount borrowed (Principal) = $22,000.
Simple interest, I = $78.40.
Time = 4 year.
To determine the interest rate on the stock in four (4) years:
Mathematically, simple interest can be calculated by using this formula:
I = PRT
Where:
Making R the subject of formula, we have:
R = I/PT
Substituting the given parameters into the formula, we have;
R = 6260/(22,000 × 4)
R = 6260/(88,000)
Interest rate = 0.071 = 7.1%.
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