Write a class encapsulating the concept of coins, assuming that Coins has the following attributes: a number of quarters, a number of dimes, a number of nickels and a number of pennies. Include constructors, accessors, mutators, and methods toString() and equals(). Also code the following other methods: one returning the total amount of money, and the others returning the money in quarters (for instance, 0.75 if there are three quarters), in dimes, in nickels, and in pennies. Write a client class to test all the methods in your class. Print the total amount of money in dollar notation with two significant digits after the decimal point.