Now, write a program that declares an array of five purchase objects and prompt a user for their values. as each purchase object is created, continuously prompt until the user enters an invoice number between 1000 and 8000 inclusive and a non-negative sale amount. prompt the user for values for each object and then display all the values.

An air compression refrigeration system is to have an air pressure of 100 psia in the brine tank and an allowable air temperature increase of 60°f for standard vapor compression cycle temperatures of 77 f entering the expansion cylinder and 14 f entering the compression cylinder, calculate the coefficient of performance a. 2.5 b 3.3 c. 4.0 d. 5.0