Most modern transaction processing systems use processing—a real-time method in which each transaction is processed as it is entered.

The answer to this is actually implied in the question: the type of transaction processing described is called real-time processing.

In real-time processing, transactions are processed immediately when it happens.

This is in contrast to another type of transaction processing called batch processing, where multiple transaction over a period of time are accumulated and then processed as one.

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"we first find value of tax in dollars.

the difference between the two prices   is: 23. 54 - 22 = 1.54

therefore the sales tax in dollars is 1.54

the tax % will be   (amount of tax / original cost price ) × 100

(1.54 / 22) × 100  → (0.07) × 100 =   7

so the tax rate is 7%

we can double check the answer.

7 % of 22   → (7/100) × 22 → 0.07 × 22 = 1.54

22 + 1.54 = 23.54"