<h3><u>Answer</u>

ΔABF is an isosceles right triangle,BC=20-18

</h3>
Answer:
She will owe $180 of interest after one year.
She will owe $720 of interest after four years.
She will need to pay the bank $3,720 to completely pay off the loan.
Step-by-step explanation:
Solution:
<u>Note that:</u>
<u>Using cross multiplication:</u>
- (3x)/20 = (4x + 2)/28
- => (3x) × 28 = (4x + 2) × 20
<u>Simplifying both sides:</u>
<u>Subtracting 80x both sides:</u>
- 84x = 80x + 40
- => 84x - 80x = 80x + 40 - 80x
<u>Simplify the LHS:</u>
- => 84x - 80x = 40
- => 4x = 40
- => x = 10