A = $1,120 B = $5120
Explanation:
1.4/100 = 0.014
0.014 x 4000 = 56
1.4% interest on the $4,000 is $56.
56 x 20 (years) = 1,120
A= $1,120
To get B simply add 1,120 to 4000.
1,120 + 4000 = 5120
B = 5120.
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