Question: Support computing sales tax in the CashRegister class. The tax rate should be supplied when constructing a CashRegister object. Add recordTaxablePurchase and getTotal- Tax methods.

Support computing sales tax in the CashRegister class. The tax rate should be supplied when constructing a CashRegister object. Add recordTaxablePurchase and getTotal- Tax methods. (Amounts added with recordPurchase are not taxable.) The giveChange method should correctly reflect the sales tax that is charged on taxable items.

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