The total amount Sam will pay in all will be $2,400,000
<h3>Simple interest </h3>
From the question, we are to determine the interest Sam pays in all
Using the simple interest formula, 
I = PRT 
From the given information, 
P = $2,000,000
R = 5% = 0.05 
T = 4 
Putting the parameters into the formula, 
I = $2000000 × 0.05 × 4
I = $400000
The interest Sam will pay is $400,000 
The total amount Sam will pay in all will be $2,000,000 + $400,000
= $2,400,000
Hence, the total amount Sam will pay in all will be $2,400,000
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