Gary is balancing his checking account with his spending. His checking account shows a balance of $750.83. He has accounted for all of the deposits and purchases he has made except for one transaction. He cannot remember the exact cost of a pen set he purchased as a gift for a number of friends. He also can not remember exactly how many of the sets he purchased. Not including that purchase, he has calculated that his account balance should be $855.83. Using rational numbers for n and p, write an expression in the form of: Balance + (n)(–p) to represent one possible scenario for the number of pen sets purchased, n, and the price of each set, p. Explain why this form of the expression makes sense and why the numbers you have chosen for n and p make sense in this scenario. Write your answer in the box below.