Lisa Kane borrowed $8,000 on an 8%, 60-day note. After 15 days, Lisa paid $2,000 on the note. On day 45, Lisa paid $1,000 on the note. What is the total interest and ending balance due by the U.S. rule? Use ordinary interest.

Borrowed $14,000.00 at 8% for 90 days.What is the interest?

To calculate the total interest and ending balance due by the U.S. rule with ordinary interest, we need to follow a few steps.

Step 1: Calculate the interest for the first payment:
- Note amount: $8,000
- Interest rate: 8%
- Time: 15 days (0.041 years)
- Interest formula: Interest = Principal x Rate x Time
- Interest for the first payment = $8,000 x 0.08 x 0.041 = $26.40

Step 2: Calculate the remaining principal after the first payment:
- Remaining principal = $8,000 - $2,000 = $6,000

Step 3: Calculate the interest for the second payment:
- Note amount (remaining principal): $6,000
- Interest rate: 8%
- Time: 30 days (0.082 years, remaining days of the 60-day note - 15 days of the first payment)
- Interest for the second payment = $6,000 x 0.08 x 0.082 = $39.36

Step 4: Calculate the remaining principal after the second payment:
- Remaining principal = $6,000 - $1,000 = $5,000

Step 5: Calculate the interest for the remaining days (from day 45 to day 60):
- Note amount (remaining principal): $5,000
- Interest rate: 8%
- Time: 15 days (0.041 years, remaining days of the 60-day note)
- Interest for the remaining days = $5,000 x 0.08 x 0.041 = $16.40

Step 6: Calculate the total interest:
- Total interest = Interest for the first payment + Interest for the second payment + Interest for the remaining days
- Total interest = $26.40 + $39.36 + $16.40 = $82.16

Step 7: Calculate the ending balance due:
- Ending balance due = Total note amount - Total payments
- Total payments = $2,000 + $1,000 = $3,000
- Ending balance due = $8,000 - $3,000 = $5,000

Therefore, the total interest is $82.16, and the ending balance due by the U.S. rule is $5,000.