Balance: In financial questions - the amount of money in a bank account
Credit: Money that goes into a bank account
Debit: Money that leaves a bank account
Expense: Money spent on items or services
Deposit: an initial payment (often a way of securing an item you will later pay for)
Multiplier: The number that you are multiplying by.
Per Annum: each year
Currency: Money, such as coins or banknotes, used as a medium of exchange.
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Unitary: one - the cost of one.