Sandra sells necklaces at a school craft fair. She uses the equation P = 7.5n - (2.25n + 15) to determine her total profit at the fair. Based on this equation, how much does she charge for each necklace?

a. $2.25B. $7.50C. $15.00D. $17.25

Given that the total profit is determined using the equation:

P=7.5n - (2.25n+15)

The minimum cost of necklace will be found as follows:

writing the above is straight line form of y=mx+c, where m is the slope and c is the y-intercept we get

P=7.5n-2.25n-15

P=5.25n-15

thus the slope is 5.25

the y-intercept is at (0,-15)

the minimum amount is 15

Answer: C. $15