### Home > CCAA > Chapter 7 Unit 6 > Lesson CC2: 7.1.8 > Problem 7-90

Ida wants to buy a car, but she currently does not have any money. The car she wants costs

She could borrow

at a monthly interest rate of simple interest and pay the total after months. Write a simple-interest expression and calculate what she would owe at the end of months. Use the equation for simple interest from the Math Notes box in this lesson.

where: dollars per month in interest interest over months How much total money does Ida owe under this option if her borrowed amount is

and her interest would be ? She could borrow

at a weekly interest rate of simple interest and pay the total after months. Show calculations and a written explanation to justify your answer. Use the same interest formula from part (a).

There are

weeks in a year. Ida owes

with this option. Be sure to show how to get this answer and explain which one of the two loan options is better and why.