- Implement a Data Structure for Rational Number and create a method neg to class Rational that is used like this:
x.neg // evaluates to -x
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Create a method sub to subtract two rational numbers and find an answer x-y-z where x=3/4, y=5/8, z=2/7.
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Implement a Data Structure for Account and create a method transfer which transfer the money from this account to a given account.
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A Bank defines as List of Accounts. So implement the following functions:
4.1 List of Accounts with negative balances
4.2 Calculate the sum of all account balances
4.3 Calculate the final balances of all accounts after apply the interest function as fallows:
If balance is positive, deposit interest is .05 and if balance is negative, overdraft interest is .1
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