A = $5,800.00 
 
I = A - P = $1,800.00 
 
hey!
Equation: 
A = P(1 + rt) 
 
Calculation: 
First, converting R percent to r a decimal 
r = R/100 = 15%/100 = 0.15 per year. 
 
Solving our equation: 
A = 4000(1 + (0.15 × 3)) = 5800 
A = $5,800.00 
 
The total amount accrued, principal plus interest, from simple interest on a principal of $4,000.00 at a rate of 15% per year for 3 years is $5,800.00.
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hope i helped in some way..have great day!