You (or your parents) purchase a new car for $19.725.00 plus 4.75% sales tax. The down payment is $2.17500 and you for your parents) have an average credit rating Use the table
below to determine how much interest is accrued after the first month.
Credit
Excellent
Good
Secured
APR (%)
4.80
5.15
5.85
7.00
8.20
Unsecured
APR (%)
5.25
5.65
6.20
Average
Fair
Poor
$74.18
$195.16
$90.12
$121.09

  $90.12

Step-by-step explanation:

The principal amount of the loan is ...

  (sale price)(1 + sales tax rate) - (down payment)

  = $19,725×1.0475 -2175 = $18,486.94

For a secured loan, the APR charged for an average credit rating appears to be 5.85%, so the interest for the first month is ...

  i = Prt = ($18,486.94)(0.0585)(1/12)

  i = $90.12

the revenue of the fitness center, y, is the product of two factors: the number of members and the fee paid by each member. there are 320 members now, but number of members goes down by 10 for each $5 increase in fees, so if x is the number of $5 price increases then members is equal to (320 - 10x). since the fee is currently $45, and the fee increases by $5 for every price bump x, the fee is given by (45 + 5x). so, revenue y is given by y = (320 - 10x)(45 + 5x).