Math OER welcome page Zoom Room Zoom logo Jamboard Jamboard logo Lectures YouTube playlist Textbook textbook cover       valid HTML 4.01
Welcome Study Skills Library Playgrounds Resources Syllabus
Shapeshifting Topic Mad  Science Topic Justice Topic Health Decisions Topic Personal Finance Topic Business Decisions

Math OER
 Turn In Problems 
 Business Decisions — Charge Options 

The greatest reward for a student is not a good grade. It is the willingness of his teacher to listen to him.

- Nikolay Konstantinov

homework turn in box You attempted the ten exercises for this topic. Those problems did not have an answer key. Use this form to ask me how well you did.

Before using this page, you should have your homework completed on paper. This page is only for submitting your homework. To be short and concise it lacks any diagrams, pictures, or tables needed to work the problems.

Answer every question. Then use the button at the bottom of the page to create a code by processing your answers. Copy-and-paste the code into an e-mail.


Raynor starts a new credit card that charges 24% annual interest per year to keep his bookkeeping simple when buying a $1,499 computer. (He will use the card for nothing else.) The credit card charges him one-twelfth of its annual interest rate each month. Raynor pays $140 per month until the balance is paid off. Fill in the last parts of the table below.

1. The month nine ending amount, also the month ten starting amount...

$382.86 $390.67 $398.48 $476.62

2. The month ten amount on which interest was due...

$242.86 $250.67 $258.48 $336.62

3. The month ten amount of interest...

$4.86 $5.01 $5.17 $5.52

4. The month ten ending amount, also the month eleven starting amount...

$253.31 $263.65 $393.31 $403.65

5. The month eleven amount on which interest was due...

$113.31 $123.65 $253.31 $263.65

6. The month eleven amount of interest...

$2.27 $2.47 $5.07 $5.80

7. The month eleven ending amount, also the month twelve starting amount and payment amount...

$111.30 $116.24 $121.18 $126.12

8. Continuing the previous problem, find his total interest in dollars.

$163.30 $159.48 $167.12 $175.10

9. Continuing the previous problem, find what percentage of his first month's payment was interest.

2% 9% 10% 19%

10. Continuing the previous problem, find what percentage of his tenth month's payment was interest.

2% 4% 35% 54%