Download 7-95.

7-90. Ida wants to buy a car, but she currently does not have any money. The car she wants
costs $2500. Consider her two options and decide which loan she should take.
a. She could borrow $2500 at a monthly interest rate of 4% simple interest and pay the total
after 12 months. Write a simple-interest expression and calculate what she would owe at
the end of 12 months.
b. She could borrow $2500 at a weekly interest rate of 1% simple interest and pay the total
after 12 months. Show calculations and a written explanation to justify your answer.
7-91. The Jones family wants to remodel their kitchen. They have saved $23,000 in the last two
years. Their contractor says the remodel will cost $40,000. They can borrow the difference at a
monthly interest rate of 2% simple interest. If they pay the loan off in six months, how much
will they have paid?
7-92. The electronics department is having a No Sales Tax Sale! In addition, all of the items in
the department are on sale for 25% off. Wyatt is looking at a music player that normally costs
$120. He has $95 to spend, and he is wondering if he has enough money to buy it.
Wyatt sketched the diagram at right. Use the work he started to find 25% of $120. Is this the
price he will pay?
a. Does Wyatt have enough money?
b. Would he have enough money if he had to pay the 5.5% sales tax on the sale price?
7-93. For each equation below, solve for x. Show the process you use to check your answer.
2
3
b. 5x = 0
c. x − 14.6 = 2.96
a. x – = 1
5
5
7-94. Marty is saving money to buy a new computer. He received $200 for his birthday and
saves $150 of each week’s paycheck. Does this situation represent a proportional
relationship? If it does, identify the constant of proportionality. If it does not, explain why not.
7-95. Elvin found the box plot below in the school newspaper.
a) Based on the plot, what percent of students watch more than 10 hours of television each
week?
b) Based on the plot, what percent of students watch less than 5 hours of television each
week?
c) Can Elvin use the plot to find the mean (average) number of hours of television students
watch each week? If so, what is it? Explain your reasoning.
d) Can he use the plot to find the median? If so, what is it? Explain your reasoning. a