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An informational Interest rate calculator for a fixed term deposit needs to be tested. For a given deposit amount and the client’s age, the calculator shows the annual interest rate.

The following rules apply:

  • The minimum deposit amount is $100.
  • The maximum deposit amount is $10,000.
  • The annual interest rate depends on the deposit amount as follows:
    Deposit amountAnnual interest rate
    $100 - $9991.0%
    $1,000 - $4,9991.3%
    $5,000 - $10,0001.5%
  • Only adults (aged 18 and older) are eligible to open a term deposit account.
  • Clients aged 60 and older have a fixed interest rate of 2%.

Define the optimal (effective and efficient) set of test cases for a system that calculates the terms deposit interest.

Test cases

Test case 1
DepositAgeInterest Rate