Chloe swam “n” number of laps to raise money for her school. Friend A donated $20.00 plus $1.25 for every lap Chloe swam. Friend B donated $15.00 plus $2.50 for every lap Chloe swam. Friend C donated $40.00 plus $1.50 for every lap Chloe swam. Friend D donated $25.00 plus $1.75 for every lap Chloe swam. Part A Write a variable expression to represent how much the four friends donated altogether. Let, n, represent the number of laps Chloe swam. How many laps did Chloe swim if her four friends raised $450 all together?