In restaurant S, 70\% of the total visitors use debit cards, and 30\% pay by cash. Among the cash payers, 30\% receive a 2\% cashback. If the number of people using debit cards is 630, how many people get a 2\% cashback on cash payments?

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**Solution:**

1. Let the total number of people visiting restaurant S be $100m$.

2. Given that 70\% of the visitors use debit cards, so:
   $$70m = 630 \implies m = \frac{630}{70} = 9$$

3. The remaining 30\% pay by cash, so the number of cash payers is:
   $$30m = 30 	imes 9 = 270$$

4. Among cash payers, 30\% get 2\% cashback. Therefore, the number of people getting 2\% cashback is:
   $$30\% 	ext{ of } 270 = \frac{30}{100} 	imes 270 = 81$$

**Answer:** 81

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